WebDAV sync fails

I’m using a Pixel 4 running Android 10.

I set up WebDAV sync in the settings. The configuration check was successful. However, when I attempted to sync, I got the following error:

MKOL . sync/:
Unknown error 2 (403):[syncReport-

Log is attached.

1587919020216.txt|attachment](upload://xviOdy9SIV98s67NjZK38goCnDn.txt) (75.8 KB)

Can anyone help me resolve this?

Thanks in advance,