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If you do a you’ll find a lot of posts with folks in a similar spot. Unfortunately, unless you can regain access to the account credentials, you’ll need to add the domain to an account you can access. To do that,
+Add a site, enter the details and select a plan type. From there, have your registrar change the nameservers and make sure you have the IP address of your origin server (host) to update the DNS records in your new account.