Unclear error when attempting to impersonate OAuth2 application creator

Steps to reproduce:

1. Sign in as portal admin
2. Create OAuth2 Application with clientId = 12345, set up only PKCE grant and save
3. Edit permissions ... grant User role permissions to VIEW UPDATE and CREATE_TOKEN
4. Go to Roles and assign User role ACCESS_IN_CONTROL_PANEL for OAuth 2 Administration portlet
5. Create a new user and sign in
6. Go to Control Panel -> OAuth 2 Administration
7. Set secret (e.g. 12345) and enable Client credentials flow, save

Actual Result: An error appears as expected, but the error message reads:

Error: This operation cannot be performed because you cannot impersonate user {1}.

Expected Result: The "{1}" should be replaced with more understandable user info (e.g. user sn or user name).