After a successful and seemingly uneventful upgrade from v27.1.5 to v27.1.6, none of my connected devices/services can access *DAV functionality, giving HTTP Error 405 and 401.
Internal Server Error
The server was unable to complete your request.
If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
I have already run maintenance:update:htaccess and had my hosted VPS Provider reboot my NextCloud.
All other functionality on the web or via the various APIs for the apps continues without interruption.
Logging into DAVx5 using the NextCloud method instead of username, server, app password results in no errors, but nothing being discovered by DAVx5. The account remains empty.