Steps to Reproduce:

1. Create an OSD cluster by selecting the infrastructure type as a Red Hat cloud account.
2. Once the cluster is in Ready status, navigate to the Access Control tab.
3. Click on the AWS infrastructure access tab and click on the Grant role button.
4. Try adding a valid/ invalid AWS IAM ARN and click on the Grant role button.

Expected Result:
There should be a toast message shown to the user

Actual Result
Toast message is not shown to the user.