Google Workspace set up issue

Hi everyone,

I need your help with an error I get when I try to set up a Google workspace account for an existing domain name. I purchased the domain name at Porkbun recently and for some reason it keeps giving me this notification. I also tried to other domain names I own and they are accepted when I insert them here.

The only difference with my other 2 domain names is that this recently purchased domain name from Porkbun doesn't have a hosting yet. Could that be the reason? Or is there anything else I'm missing?