Can you be more specific? Specifically:
- Are you using an email address to login?
- What WebDAV URL are you testing against?
- Can you share the full
curlcommand you’re using? - Are you using local accounts?
What appears in your Nextcloud log?
It would also be helpful if you shared your full parsed config (occ config:list system) and app list (occ app:list) as requested in the support template.
Do you have any warnings or errors under Admin settings->Overview?