Forwarding URL Security Warning

I just moved my website from my temporary URL to a one I had on wix. Now I wanted to forward from my old tempoaray url to the new one. the temp one is https://christian-grothe.krischomat.de and the new one is https://www.christian-grothe.com. But I am getting a security error when I use the temp link now. What can I do here?

https://christian-grothe.krischomat.de is going to https://www.christian-grothe.de (note the ending in .de), not .com.

➜  ~ curl https://christian-grothe.krischomat.de -sSI                
HTTP/2 301 
date: Tue, 10 May 2022 12:27:37 GMT
location: https://www.christian-grothe.de

christian-grothe.de isn’t proxied through Cloudflare and presents an expired, invalid certificate.

OMG… how stupid is that… for sure is has to go to .com…