diff --git a/x-pack/legacy/plugins/siem/public/containers/case/api.ts b/x-pack/legacy/plugins/siem/public/containers/case/api.ts
index bd243d0ba5f64..69e1602b3d981 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/api.ts
+++ b/x-pack/legacy/plugins/siem/public/containers/case/api.ts
@@ -47,6 +47,8 @@ import {
   decodeServiceConnectorCaseResponse,
 } from './utils';
 
+import * as i18n from './translations';
+
 export const getCase = async (
   caseId: string,
   includeComments: boolean = true,
@@ -240,6 +242,11 @@ export const pushToService = async (
       signal,
     }
   );
+
+  if (response.status === 'error') {
+    throw new Error(response.serviceMessage ?? response.message ?? i18n.ERROR_PUSH_TO_SERVICE);
+  }
+
   return decodeServiceConnectorCaseResponse(response.data);
 };
 
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/configure/use_configure.tsx b/x-pack/legacy/plugins/siem/public/containers/case/configure/use_configure.tsx
index 6524c40a8e6e4..19d80bba1e0f8 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/configure/use_configure.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/configure/use_configure.tsx
@@ -21,7 +21,11 @@ interface PersistCaseConfigure {
 export interface ReturnUseCaseConfigure {
   loading: boolean;
   refetchCaseConfigure: () => void;
-  persistCaseConfigure: ({ connectorId, closureType }: PersistCaseConfigure) => unknown;
+  persistCaseConfigure: ({
+    connectorId,
+    connectorName,
+    closureType,
+  }: PersistCaseConfigure) => unknown;
   persistLoading: boolean;
 }
 
@@ -97,19 +101,20 @@ export const useCaseConfigure = ({
       const saveCaseConfiguration = async () => {
         try {
           setPersistLoading(true);
+          const connectorObj = {
+            connector_id: connectorId,
+            connector_name: connectorName,
+            closure_type: closureType,
+          };
           const res =
             version.length === 0
-              ? await postCaseConfigure(
+              ? await postCaseConfigure(connectorObj, abortCtrl.signal)
+              : await patchCaseConfigure(
                   {
-                    connector_id: connectorId,
-                    connector_name: connectorName,
-                    closure_type: closureType,
+                    ...connectorObj,
+                    version,
                   },
                   abortCtrl.signal
-                )
-              : await patchCaseConfigure(
-                  { connector_id: connectorId, closure_type: closureType, version },
-                  abortCtrl.signal
                 );
           if (!didCancel) {
             setPersistLoading(false);
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
index a453be32480e2..d5ea287fd2cdd 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
+++ b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
@@ -63,3 +63,10 @@ export const SUCCESS_SEND_TO_EXTERNAL_SERVICE = i18n.translate(
     defaultMessage: 'Successfully sent to ServiceNow',
   }
 );
+
+export const ERROR_PUSH_TO_SERVICE = i18n.translate(
+  'xpack.siem.case.configure.errorPushingToService',
+  {
+    defaultMessage: 'Error pushing to service',
+  }
+);
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/use_get_cases.tsx b/x-pack/legacy/plugins/siem/public/containers/case/use_get_cases.tsx
index 323dc23e1b24e..1cbce5af6304b 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/use_get_cases.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/use_get_cases.tsx
@@ -35,7 +35,7 @@ export type Action =
     }
   | { type: 'FETCH_FAILURE'; payload: string }
   | { type: 'FETCH_UPDATE_CASE_SUCCESS' }
-  | { type: 'UPDATE_FILTER_OPTIONS'; payload: FilterOptions }
+  | { type: 'UPDATE_FILTER_OPTIONS'; payload: Partial<FilterOptions> }
   | { type: 'UPDATE_QUERY_PARAMS'; payload: Partial<QueryParams> }
   | { type: 'UPDATE_TABLE_SELECTIONS'; payload: Case[] };
 
@@ -68,7 +68,10 @@ const dataFetchReducer = (state: UseGetCasesState, action: Action): UseGetCasesS
     case 'UPDATE_FILTER_OPTIONS':
       return {
         ...state,
-        filterOptions: action.payload,
+        filterOptions: {
+          ...state.filterOptions,
+          ...action.payload,
+        },
       };
     case 'UPDATE_QUERY_PARAMS':
       return {
@@ -119,8 +122,8 @@ interface UseGetCases extends UseGetCasesState {
     refetchCasesStatus,
   }: UpdateCase) => void;
   refetchCases: (filters: FilterOptions, queryParams: QueryParams) => void;
-  setFilters: (filters: FilterOptions) => void;
-  setQueryParams: (queryParams: QueryParams) => void;
+  setFilters: (filters: Partial<FilterOptions>) => void;
+  setQueryParams: (queryParams: Partial<QueryParams>) => void;
   setSelectedCases: (mySelectedCases: Case[]) => void;
 }
 
@@ -139,11 +142,11 @@ export const useGetCases = (initialQueryParams?: QueryParams): UseGetCases => {
     dispatch({ type: 'UPDATE_TABLE_SELECTIONS', payload: mySelectedCases });
   }, []);
 
-  const setQueryParams = useCallback((newQueryParams: QueryParams) => {
+  const setQueryParams = useCallback((newQueryParams: Partial<QueryParams>) => {
     dispatch({ type: 'UPDATE_QUERY_PARAMS', payload: newQueryParams });
   }, []);
 
-  const setFilters = useCallback((newFilters: FilterOptions) => {
+  const setFilters = useCallback((newFilters: Partial<FilterOptions>) => {
     dispatch({ type: 'UPDATE_FILTER_OPTIONS', payload: newFilters });
   }, []);
 
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/columns.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/columns.tsx
index f757fd33a93a8..0e12f78e29bc2 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/columns.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/columns.tsx
@@ -77,7 +77,7 @@ export const getCasesColumns = (
               size="s"
             />
             <Spacer data-test-subj="case-table-column-createdBy">
-              {createdBy.fullName ?? createdBy.username ?? ''}
+              {createdBy.fullName ? createdBy.fullName : createdBy.username ?? ''}
             </Spacer>
           </>
         );
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
index 161910bb5498a..b0ff3dbada6c9 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
@@ -254,11 +254,11 @@ export const AllCases = React.memo<AllCasesProps>(({ userCanCrud }) => {
   const onFilterChangedCallback = useCallback(
     (newFilterOptions: Partial<FilterOptions>) => {
       if (newFilterOptions.status && newFilterOptions.status === 'closed') {
-        setQueryParams({ ...queryParams, sortField: SortFieldCase.closedAt });
+        setQueryParams({ sortField: SortFieldCase.closedAt });
       } else if (newFilterOptions.status && newFilterOptions.status === 'open') {
-        setQueryParams({ ...queryParams, sortField: SortFieldCase.createdAt });
+        setQueryParams({ sortField: SortFieldCase.createdAt });
       }
-      setFilters({ ...filterOptions, ...newFilterOptions });
+      setFilters(newFilterOptions);
     },
     [filterOptions, queryParams]
   );
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/use_push_to_service/index.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/use_push_to_service/index.tsx
index aeb694e52b7fa..4f370ec978906 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/use_push_to_service/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/use_push_to_service/index.tsx
@@ -74,7 +74,11 @@ export const usePushToService = ({
     if (actionLicense != null && !actionLicense.enabledInLicense) {
       errors = [...errors, getLicenseError()];
     }
-    if (connector == null && !loadingCaseConfigure && !loadingLicense) {
+    if (
+      (connector == null || (connector != null && connector.connectorId === 'none')) &&
+      !loadingCaseConfigure &&
+      !loadingLicense
+    ) {
       errors = [
         ...errors,
         {
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
index 89b94d98f91db..bcb4edd6129a6 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
@@ -134,8 +134,8 @@ export const UserActionItem = ({
     <EuiFlexItem>
       <EuiFlexGroup gutterSize={'none'}>
         <EuiFlexItem data-test-subj={`user-action-${id}-avatar`} grow={false}>
-          {(fullName && fullName.length > 0) || username.length > 0 ? (
-            <UserActionAvatar name={fullName ?? username} />
+          {(fullName && fullName.length > 0) || (username && username.length > 0) ? (
+            <UserActionAvatar name={fullName && fullName.length > 0 ? fullName : username ?? ''} />
           ) : (
             <EuiLoadingSpinner className="userAction_loadingAvatar" />
           )}
diff --git a/x-pack/plugins/case/server/routes/api/cases/find_cases.ts b/x-pack/plugins/case/server/routes/api/cases/find_cases.ts
index e7b2044f2badf..b2716749e9749 100644
--- a/x-pack/plugins/case/server/routes/api/cases/find_cases.ts
+++ b/x-pack/plugins/case/server/routes/api/cases/find_cases.ts
@@ -31,9 +31,10 @@ const buildFilter = (
 ): string =>
   filters != null && filters.length > 0
     ? Array.isArray(filters)
-      ? filters
+      ? // Be aware of the surrounding parenthesis (as string inside literal) around filters.
+        `(${filters
           .map(filter => `${CASE_SAVED_OBJECT}.attributes.${field}: ${filter}`)
-          ?.join(` ${operator} `)
+          ?.join(` ${operator} `)})`
       : `${CASE_SAVED_OBJECT}.attributes.${field}: ${filters}`
     : '';