Traefik 2 domains

Hello,

I am running Traefik 1.7 inside a docker enviorment.
The issue is that i would like to use 2 domains test.example.com and test.example2.com to forward to docker hosts.
It does not wan't to start working and keeps showing a 521 error from Cloudflare.
If I remove 1 of the 2 domains everything works fine.

Thanks in advanced.