Attempting to add Server 2019/Hyper-V 2019 may fail with an access or timeout issue when Veeam is installed on Server 2016/Windows 10.
When attempting to add Hyper-V 2019:
Error Failed to connect to host 192.168.1.26
Error Access denied or timeout expired.
Error Check if you have local administrator privileges on computer '192.168.1.26'.
Error Possible reasons:
Error 1. Invalid credentials.
Error 2. Specified host is not a Hyper-V server. (System.Exception)