when I opened the Anki app, I’ve got a message about the error in Ankihub add-on.
Error message was following:
Anki 23.12.1 (1a1d4d54) (ao)
Python 3.9.15 Qt 6.5.3 PyQt 6.5.3
Platform: macOS-13.7.1-arm64-arm-64bit
Hello,
This is in relation to the scheduled downtime. It was announced in this email: 
AnkiHub Downtime for Maintenance
It should be done soon. 