diff --git a/packages/credential-provider-ini/src/fromIni.integ.spec.ts b/packages/credential-provider-ini/src/fromIni.integ.spec.ts
index 0cb0e93c00bd..db15da42fa6c 100644
--- a/packages/credential-provider-ini/src/fromIni.integ.spec.ts
+++ b/packages/credential-provider-ini/src/fromIni.integ.spec.ts
@@ -174,7 +174,7 @@ describe("fromIni region search order", () => {
     });
   });
 
-  it("should use 2nd priority for the context client", async () => {
+  it("should use 2nd priority for the profile region", async () => {
     const sts = new STS({
       requestHandler: new MockNodeHttpHandler(),
       region: "ap-northeast-2",
@@ -190,21 +190,21 @@ describe("fromIni region search order", () => {
     expect(credentials).toContain({
       accessKeyId: "STS_AR_ACCESS_KEY_ID",
       secretAccessKey: "STS_AR_SECRET_ACCESS_KEY",
-      sessionToken: "STS_AR_SESSION_TOKEN_ap-northeast-2",
+      sessionToken: "STS_AR_SESSION_TOKEN_us-stsar-1",
     });
   });
 
-  it("should use 3rd priority for the profile region if not used in the context of a client with a region", async () => {
-    const credentialsData = await fromIni({
-      clientConfig: {
-        requestHandler: new MockNodeHttpHandler(),
-      },
-    })();
+  it("should use 3rd priority for the caller client", async () => {
+    delete iniProfileData.default.region;
 
     const sts = new STS({
       requestHandler: new MockNodeHttpHandler(),
       region: "ap-northeast-2",
-      credentials: credentialsData,
+      credentials: fromIni({
+        clientConfig: {
+          requestHandler: new MockNodeHttpHandler(),
+        },
+      }),
     });
 
     await sts.getCallerIdentity({});
@@ -212,7 +212,7 @@ describe("fromIni region search order", () => {
     expect(credentials).toContain({
       accessKeyId: "STS_AR_ACCESS_KEY_ID",
       secretAccessKey: "STS_AR_SECRET_ACCESS_KEY",
-      sessionToken: "STS_AR_SESSION_TOKEN_us-stsar-1",
+      sessionToken: "STS_AR_SESSION_TOKEN_ap-northeast-2",
     });
   });
 
diff --git a/packages/credential-provider-ini/src/resolveAssumeRoleCredentials.ts b/packages/credential-provider-ini/src/resolveAssumeRoleCredentials.ts
index 1e9b7942555a..29d5648cee04 100644
--- a/packages/credential-provider-ini/src/resolveAssumeRoleCredentials.ts
+++ b/packages/credential-provider-ini/src/resolveAssumeRoleCredentials.ts
@@ -119,10 +119,7 @@ export const resolveAssumeRoleCredentials = async (
         credentialProviderLogger: options.logger,
         parentClientConfig: {
           ...options?.parentClientConfig,
-          // The profile region is the last fallback, and only applies
-          // if the clientConfig.region is not defined by the user
-          // and no contextual outer client configuration region can be found.
-          region: options?.parentClientConfig?.region ?? region,
+          region: region ?? options?.parentClientConfig?.region,
         },
       },
       options.clientPlugins
diff --git a/packages/credential-provider-node/src/credential-provider-node.integ.spec.ts b/packages/credential-provider-node/src/credential-provider-node.integ.spec.ts
index b57651770bb9..b2ac2def6744 100644
--- a/packages/credential-provider-node/src/credential-provider-node.integ.spec.ts
+++ b/packages/credential-provider-node/src/credential-provider-node.integ.spec.ts
@@ -398,7 +398,7 @@ describe("credential-provider-node integration test", () => {
       expect(credentials).toEqual({
         accessKeyId: "STS_AR_ACCESS_KEY_ID",
         secretAccessKey: "STS_AR_SECRET_ACCESS_KEY",
-        sessionToken: "STS_AR_SESSION_TOKEN_us-west-2",
+        sessionToken: "STS_AR_SESSION_TOKEN_us-stsar-1",
         expiration: new Date("3000-01-01T00:00:00.000Z"),
         $source: {
           CREDENTIALS_PROFILE_SOURCE_PROFILE: "o",
@@ -805,7 +805,7 @@ describe("credential-provider-node integration test", () => {
   });
 
   describe("Region resolution for code-level providers given to a client", () => {
-    it("fromCognitoIdentity provider should use context client region", async () => {
+    it("fromCognitoIdentity provider should use caller client region", async () => {
       sts = new STS({
         region: "ap-northeast-1",
         credentials: fromCognitoIdentity({
@@ -824,7 +824,7 @@ describe("credential-provider-node integration test", () => {
       });
     });
 
-    it("fromCognitoIdentityPool provider should use context client region", async () => {
+    it("fromCognitoIdentityPool provider should use caller client region", async () => {
       sts = new STS({
         region: "ap-northeast-1",
         credentials: fromCognitoIdentityPool({
@@ -843,7 +843,7 @@ describe("credential-provider-node integration test", () => {
       });
     });
 
-    it("fromIni assumeRole provider should use the context client's region for STS", async () => {
+    it("fromIni assumeRole provider should use the caller client's region for STS", async () => {
       sts = new STS({
         region: "eu-west-1",
         credentials: fromIni(),
@@ -875,7 +875,7 @@ describe("credential-provider-node integration test", () => {
       });
     });
 
-    it("fromWebToken provider should use context client region", async () => {
+    it("fromWebToken provider should use caller client region", async () => {
       sts = new STS({
         region: "ap-northeast-1",
         credentials: fromWebToken({
@@ -899,7 +899,7 @@ describe("credential-provider-node integration test", () => {
 
     it.skip(
       "fromSSO (SSO) provider is excluded from testing because the SSO_REGION is a required parameter and is used " +
-        "instead of any fallback to the context client region",
+        "instead of any fallback to the caller client region",
       async () => {}
     );
 
diff --git a/packages/credential-providers/src/createCredentialChain.spec.ts b/packages/credential-providers/src/createCredentialChain.spec.ts
index 04f5fbb67962..0cbee3d05553 100644
--- a/packages/credential-providers/src/createCredentialChain.spec.ts
+++ b/packages/credential-providers/src/createCredentialChain.spec.ts
@@ -82,11 +82,11 @@ describe(createCredentialChain.name, () => {
   });
 
   it("is compatible with contextual-region-aware credential providers", async () => {
-    const provider: RegionalAwsCredentialIdentityProvider = async ({ contextClientConfig } = {}) => {
+    const provider: RegionalAwsCredentialIdentityProvider = async ({ callerClientConfig } = {}) => {
       return {
         accessKeyId: "",
         secretAccessKey: "",
-        sessionToken: (await contextClientConfig?.region()) ?? "wrong_region",
+        sessionToken: (await callerClientConfig?.region()) ?? "wrong_region",
       };
     };
     const errorProvider = async () => {
@@ -97,7 +97,7 @@ describe(createCredentialChain.name, () => {
 
     expect(
       await chain({
-        contextClientConfig: {
+        callerClientConfig: {
           async region() {
             return "ap-northeast-1";
           },