OS5 and Windows 11 - requiring username/pw

I have a recently upgraded Windows 11 PC that when it tries to connect to a public share on My Cloud Mirror (MCM) which does not require/have a username/password defined, it asks for a username/pw. All my other Win10 machines can map the shares on the My Cloud Mirror device without an ID/pw required. Is there a change in Win11 or compatibility issue w/ MCM OS5?

“…My Cloud Mirror (MCM) which does not require/have a username/password defined…”

OS5 devices MUST have a username and password. No idea how you could get an OS5 device to work without one. Are you sure you aren’t using OS3?

I guess I didn’t make myself clear: the access to the Public share on the MCM device does not require a username/password (no users are defined for the share as it is public). There is a username/password required to login the the MCM device for administration if that’s your question.