[Environment]SDS IAM & EMM
You want to block adding accounts to the device, either in the Knox Workspace container or to the personal space.
You can block adding accounts from Mobile Device Policies > Samsung Knox Workspace Settings > Container Settings > Container Account Settings > Accounts in blacklist. Wildcards can be used to block the creation of every account type.
Add the account you want to use to the whitelist, so that it is not be blocked.
You cannot block adding accounts to the personal space as per current design.