Hello @CGMANI ,
Thank you so much for posting here.
So sorry for the inconvenience caused. We could enable the group policy "Network access: Do not allow storage of passwords and credentials for network authentication" under Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options. However, it will not disable the caching of Generic Credentials.
It is suggested that we could also disable the Credential Manager service. In my lab, I disabled the service, and below is the result.
Here is the discussion, and we could kindly have a check.
Thank you so much for your understanding and support.