Hi @isaac2093
there is a checks of your domain - https://check-your-website.server-daten.de/?q=app.renttal.mx#txt
There you see the problem.
You have created a subdomain _acme-challenge.app.renttal.mx, but the menu you use adds renttal.mx, so the name is wrong, the domain name is duplicated.
Create an entry with
_acme-challenge.app
then it should work.
Compare it with my own wildcard
