Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I have got it to work by doing 10 seconds update intervals of the Calendar link in the browser.
Before we had 3 minutes and it seemed to forget the year when updating with that interval.
Since we decreased to 10 seconds it has worked well again.
Important to stress that I am updating the link with an add-on within the browser (Tab Auto Update)
Before we closed down the browser and opened everything from scratch. That does not work with any interval.
Hopefully Microsoft can fix this ASAP so we can skip workarounds.
This worked for me, Can't guarantee it works for you.