Correctly reference used ports key when validating app ports

src/middlewared/middlewared/plugins/apps/schema_validation.py

@@ -131,7 +131,11 @@ def validate_acl_entries(self, verrors, value, question, schema_name, app_data):
             verrors.add(schema_name, f'{value["path"]}: path does not exist')
 
     async def validate_port_available_on_node(self, verrors, value, question, schema_name, app_data):
-        if app_data and value in [p['port'] for p in app_data['used_ports']]:
+        if app_data and value in [
+            host_port['host_port']
+            for port_entry in app_data['active_workloads']['used_ports']
+            for host_port in port_entry['host_ports']
+        ]:
             # TODO: This still leaves a case where user has multiple ports in a single app and mixes
             #  them to the same value however in this case we will still get an error raised by docker.
             return