Cert altname not in the certs list

Joplin 2.6.10 (prod, linux) client on ubuntu gnome 20.04lts
Client-ID: 9123be0e1b774e74b263c89cbba134ba
Sync-Version: 3
Profil-Version: 41
Revision: 98fba37
sync-target selfhosted nextcloud in VMware

The sync target ip for remote access is an dyn dns ip:
https://somename.myfritz.net/remote.php/dav/files/xxuser/joplin/
an it works well.
It is connected to the local ip:
https://192.168.178.47/remote.php/dav/files/xxuser/joplin/
but using this ip, I get the following error:

request to https://192.168.178.47/remote.php/dav/files/xxuser/joplin/ failed,
reason: Hostname/IP does not match certificate's altnames: IP: 192.168.178.47 is not in the cert's list: (Code ERR_TLS_CERT_ALTNAME_INVALID)

On another computer I use an outdated Joplin 2.5 (prod, linux) which syncs well with both ip.
What can I do about this?
Is there a log file to look up or is this nextcloud problem?

Axel

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