Starting with MacOS 12.2 Apple started requiring encryption when connecting to SMB printers. This can be disabled by adding “?encryption=no” to the end of the printer URI string. MacOS 11.6.3 and 10.5.7 with Security Update 2022-001 are also affected.
Microsoft starting requiring encryption by default on September 14, 2021 and supports a registry key to disable encryption.
If you see “Unable to start Job” on your Mac before the versions mentioned above then set this registry key on the Print Server:
Add a new registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\RpcAuthnLevelPrivacyEnabled (type DWORD)
Set the new key value to 0.
Restart the Print Spooler service.
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