Website not responding on Gateway with WARP, but fine on DoH

Hi there!
We’re having an issue where a client’s website is inaccessible when a user has Gateway with WARP mode enabled, but is just fine when Gateway with DoH mode is set. I’ve already tried to exclude the domain in question (allowing it and excluding it from scanning) but the issue is still happening. Any ideas?

The domain in question is https://scmtd.com

Thanks!