An attempt to add a Veeam Cloud Connect server produces the following error:
Failed to connect to server: user info credentials are invalid: Access is denied.
This can happen if the specified credentials are a local user that is not a built-in administrator.
Run the registry editor on the Veeam Colud Connect server.
Locate the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Create a REG_DWORD (32-bit) value LocalAccountTokenFilterPolicy and set it to 1.
Save the changes and reboot the server.