Calendar app not possible to Update or even download and activate

I tried to update the calendar app. It failed with no descriptive error. So I removed it to try a fresh download and “activation”. This is the result.
Calendar app not possible to Update or even download and activate

I tried to update the calendar app. It failed with no descriptive error. So I removed it to try a fresh download and “activation”. This is the result.
Did you try occ?
occ app:install -vv -- calendar
ernolf
It appears the server/container your Nextcloud instance is running on/in has broken DNS resolution.
At least based on the error message in the screenshot you posted.
You can easily test this by:
Well everything else worked flawlessly - also updating another app.
It worked using occ. Thank you @ernolf.
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