Unable to install Apps

After installation, setup, update(during installation) and applying the license key, I’m unable to install any Apps.
I’m presented with the following message:
“Registration of the Apps in the domain failed. It will be retried when opening this module again. This may also cause problems when installing Apps.”

Thinking I had a domain issue, I have reinstalled a number of times using different domains, and DNS settings.

Also getting this:
“Notification
An update for UCS is available. Please visit the [“Software update” module](javascript:void(0)) to install the updates.”
I did update while installing, and checking for packages I’ get this: There are no package updates available.

univention-app info:
UCS: 5.0-8 errata1106
Installed:
Upgradable:

The server can ping univention repository just fine.

“cat /var/log/univention/appcenter.log” gives me this(among other errors about the cache):
socket.timeout: The read operation timed out
31284 actions.update 24-08-22 09:53:29 [ DEBUG]: Calling update
31284 actions.update.progress 24-08-22 09:53:29 [ DEBUG]: 0

31284 actions.update 24-08-22 09:53:29 [ INFO]: Downloading “https://appcenter.software-univention.de/meta-inf/suggestions.json”…
31284 actions.update 24-08-22 09:54:29 [ ERROR]: The read operation timed out
Traceback (most recent call last):
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/init.py”, line 194, in call_with_namespace
result = self.main(namespace)
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/update.py”, line 83, in main
if self._download_supra_files(appcenter_cache):
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/update.py”, line 152, in _download_supra_files
return self._download_files(appcenter_cache, [‘app-categories.ini’, ‘rating.ini’, ‘license_types.ini’, ‘ucs.ini’, ‘suggestions.json’])
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/update.py”, line 166, in _download_files
new_etag = self._download_file(server, filename, cache_dir, etag, ucs_version)
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/init.py”, line 67, in _func
return func(*args, **kwargs)
File “/usr/lib/python3/dist-packages/univention/appcenter/actions/update.py”, line 252, in _download_file
content = response.read()
File “/usr/lib/python3.7/http/client.py”, line 478, in read
s = self._safe_read(self.length)
File “/usr/lib/python3.7/http/client.py”, line 628, in _safe_read
chunk = self.fp.read(min(amt, MAXAMOUNT))
File “/usr/lib/python3.7/socket.py”, line 589, in readinto
return self._sock.recv_into(b)
File “/usr/lib/python3.7/ssl.py”, line 1085, in recv_into
return self.read(nbytes, buffer)
File “/usr/lib/python3.7/ssl.py”, line 944, in read
return self._sslobj.read(len, buffer)

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