Webdav not syncing on mobile, fine on desktop

Operating system

iOS

Joplin version

13.2.5

Sync target

WebDAV

What issue do you have?

I installed Joplin on my Mac, configured it to sync to one of my local Synologies (only on local network). No issues at all.
I installed it on my iPad and on my iPhone separately. On each, I configured identical sync settings to what was on my Mac. When I sync, I immediately get an error.
Please check that the URL, username, password, etc. are correct and that the sync target is accessible. The reported network error was: Network request failed.
I copied the url from the app and pasted it into a browser and the share came right up. The user/pass was filled from the same vault that was used on my desktop and I am 100% positive they are fine as I can log in with them on my phone and iPad and I have zero issues. Looking at the logs on my iPhone I see what is in the attached log.

I have also tried different user accounts and disabling sync over wifi, but same result.

Any advice here?

Screenshots

Log file

mobile-log.log (20.7 KB)

That would happen when using a self-signed certificate or plain http - iOS doesn't support this

I did wonder. I’ll have to dig in on using my home CA.

Thanks!