I've already filed a bug report on this but…
I have a machine that I recently upgraded to Monterey. It has an SMB share that I want to mount. Before the upgrade to Monterey
mount -t smbfs smb://user:pass@host/volume worked.
Now that fails with an authentication error but copy and pasting the url into Finder connects properly.
I'm a bit stymied by this as this allows me to do some clever mount point things in scripts that a simple
open smb://user:pass@host/volume doesn't allow with the link in /Volumes.
Is there some hidden flag or setting that I am missing?