Apologies for my previous cryptic posting…
I have had previous discusssions on this forum about getting Joplin to sync with Nextcloud. You could possibly try these options:
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Use the Joplin WebDav connector not the Nextcloud one.
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Assuming you have a “Joplin” folder where you sync your notes try
https://nextcloud.mydomain.de:23789/remote.php/webdav/files/Joplin
If you sync to the root of the Nextcloud files storage, delete /Joplin
at the end of the URL.
I have never tried this with a non-standard port so good luck.