[Samba] Mac OS and interpretation of @ in a username. Ex user at mds.xyz doesn't work on Mac OS but does on Win 10

[torch]

Am I missing something?  I don’t see where you are using the ‘@‘ symbol anywhere.
Mac is probably interpreting the parameters “valid users” and “write list" (correctly, I think ;-) as a LIST of 3 users: joe, at, mds.xyz or bob, at, mds.xyz.

torch