Hi @stickly082
there - https://check-your-website.server-daten.de/?q=checkplz.app - you see the problem:
Your DNSSEC is broken.
Your parent zone says: You use DNSSEC. Your current zone doesn't use DNSSEC, that's fatal.
Looks like you have changed your dns provider, so your new configuration doesn't use / support DNSSEC.
Check your name server ns-1206.awsdns-22.org
to
- update, so you use DNSSEC (or)
- to refresh, so the DS record in the parent zone is removed.