I installed Sierra on my Mac today as there didn’t seem to be any major known issues affecting my configuration, and I had updated all my core apps to Sierra compliant versions. So far I’ve found one anomaly.

When printing to the MFDs I keep getting prompted for my AD credentials. My Mac isn’t bound to the AD, but in pervious versions of OS X when I had entered my staff number and password, and selected to store them in the Keychain, I would never be prompted for them again. Printing ‘just worked’. On Sierra I get the prompt for credentials each time; the dialog is pre-filled with the correct data so all I need to do is hit enter or click OK, but it’s annoying!

I have tested this on various machines, both upgrades to Sierra and fresh installs, and on new and upgraded user accounts. All show the same behaviour. It seems the same as discussed on this thread in Apple Discussions. I don’t think this is a change for the better, so I have lodged a bug report with Apple.

Update 16 December 2016 – Apple has addressed this issue with macOS 10.12.2 by adding a preference to revert to the previous behaviour.