I'm having the "Network request failed" error when syncing Joplin on mobile to a NextCloud installation. My NC WebDAV URL is domain/nextcloud/remote.php/dav/files/user/docs/joplin on HTTP only (no HTTPS)
Sync config check gives Network request failed error although user/passowrd/url are correct.
Update : Desktop client sync ok. Issue is with Joplin mobile app only. I double-checked the target NC URL (& credentials too) and it is the exact same URL from both mobile an desktop clients but mobile client not syncing.
Trying to access sync target URL from the browser gives authentication error as follows
Sabre\DAV\Exception\NotAuthenticated No public access to this resource., No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured, No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured
I met the same problem on my iPad when I sync against with my WebDAV server, the same url and account information works well on both windows and android end. I found that if I use the IP address instead of a DDNS address it sync successfully, I think the issue happens on the domain name resolution.
I had the same problem when my server did not support HTTPS. So in my case moving to HTTPS resolve the sync issue on IOS.Joplin 12.3.1, IOS 14.8, Netcloud 21.0.1.
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