Although the guide is for Porkbun, and not for Spaceship, here’s what you need to do:
Perfectly fine for this purpose, assuming the “naked” domain is what you are having issues with.
Are you sending the record(s) with the Name “www
” the same way?
If Spaceship wants you to point the domain as a CNAME
to that flutterflow host, it’s all fine on that part.
Cloudflare has nothing to do with this:
The domain registrar for that domain is “Spaceship, Inc.”, and they are the only ones that are able to help you with correcting the wrong DNSSEC configuration.
From the “tutorial” in the linked thread above, I would personally advice you to activate DNSSEC in Cloudflare, and then ask Spaceship to delete the old DS record, and add the new one from Cloudflare.