Failed authorization procedure. drammen.minby.net (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response

That doesn't work - https://check-your-website.server-daten.de/?q=drammen.minby.net%2F.well-known%2Facme-challenge%2F1234

Domainname Http-Status redirect Sec. G
http://drammen.minby.net/.well-known/acme-challenge/1234
80.241.217.171 GZip used - 132 / 169 - 21,89 % 404 Html is minified: 109,03 % 0.043 M
Not Found
https://drammen.minby.net/.well-known/acme-challenge/1234
80.241.217.171 Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 0/0 200 Html is minified: 140,00 % 3.153 A
http://drammen.minby.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
80.241.217.171 GZip used - 132 / 169 - 21,89 % Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 0/0 404 Html is minified: 109,03 % 0.043 A
Not Found
Visible Content: 404 Not Found nginx/1.10.3

https works, there is the expected result http status 200. But http doesn't work.

If you check that with your browser, your browser may use the preferred https version.

So use online tools to check such things.

So your http and https may have different root directories. Or there is an additional location definition.