I see PROPFIND 401 and OPTIONS 401 errors in my logfile too. But the cloud works fine. Seems to be normal. I am using the URL /remote.php/dav/addressbooks/users/username/addressbookname to sync. Does syncing work in your setup? Maybe the problem is not this 401 error.
i make a test with an Iphone and it’s okey.
I can sync contact.
But with android smartphone i can’t.
I make tests with carddav sync free and davdroid…
Hey, nice to hear. Could you share the solution as thread ending with “i solve my problem” without describing what was done to solve it can get frustrating for other users having a similar issue.