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Spotted your error on Line #41 of your nextcloud.subfolder.conf (it should never exist there)
rm -f /srv/dev-disk-by-label-Daten/Nextcloud/appdata/swag/nginx/proxy-confs/nextcloud.subfolder.conf
cp -a /srv/dev-disk-by-label-Daten/Nextcloud/appdata/swag/nginx/proxy-confs/nextcloud.subfolder.conf.sample /srv/dev-disk-by-label-Daten/Nextcloud/appdata/swag/nginx/proxy-confs/nextcloud.subfolder.conf
Uncomment Line #38 on /srv/dev-disk-by-label-Daten/Nextcloud/appdata/swag/nginx/ssl.conf
Like below code:
docker restart swag
docker restart nextcloud
Check if the error is gone.
Go to this Site and test what is how your Server is showing on the WAN
Yeah!!!! This was the mistake!
"All checks passed."
I tried geekflare, but every url I enter returns "Unauthorized".
Thanks for your help!