Suspended Domain & domain is already assigned and in use.4

Recently I opened multiple accounts and used “” as add-on domain and then again removed from all of that accounts.
Currently it redirects to

After that I tried to open a new account and use the same domain as an add on domain but it shows is already assigned and in use.4” while none of the accounts are using

please help! I Just want to use the domain with only one account.

I’ve checked our system but there is no account with the domain name right now. Please try to add it to your account again.