This is a clone of issue OCPBUGS-38011. The following is the description of the original issue:
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Description of problem:

1. Until OCP 4.11, the form with Name and Role in 'Dev Console -> Project -> Project Access tab' seems to have been changed to the form of Subject, Name, and Role through OCPBUGS-7800. Here, when the Subject is ServiceAccount, the Save button is not available unless Project is selected.

This seems to be a requirement to set Project/namespace.However, in the CLI, RoleBinding objects can be created without namespace with no issues.

$ oc describe rolebinding.rbac.authorization.k8s.io/monitor
Name: monitor
Labels: <none>
Annotations: <none>
Role:
Kind: ClusterRole
Name: view
Subjects:
Kind Name Namespace
---- ---- ---------
ServiceAccount monitor

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This is inconsistent with the dev console, causing confusion for developers and administrators and making things cumbersome for administrators.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

    1. Login to the web console for Developer.
    2. Select Project on the left.
    3. Select 'Project Access' tab.
    4. Add  access -> Select Sevice Account on the dropdown
   

Actual results:

   Save button is not active when no project is selected      

Expected results:

    The Save button is enabled even though the Project is not selected, so that it can be created just as it is handled in the CLI.

Additional info: