STEP-1
Verify Admin user in App settings > Click update again to confirm.
Note. If your admin username is email prefix then please ensure this email address is not associated for other users.
STEP-2
Go to App settings > Click On User Authentication.
Optional:
Some times few Inactive users may not granted license / access due to login sessions not expired.
Go to Authentication methods > SAML SSO > Edit > Un check / disable Remember user logins > Save.