Domain stuck – cannot add after 72 hours

Hello,

My domain fonds-tpe-pme.fr is new and was never used before. I changed the nameservers more than 72 hours ago and propagation is complete. But I still get the error:

“This could be due to already adding the domain to this or another account…”

I previously created the subdomain fonds-tpe-pme.rf.gd , so maybe the domain root is stuck in the backend. Can you please reset / release the domain so I can add it?

Thank you.