The hosting platform returned an error message while trying to process your request. Please try again or try making the change through the control panel. The error returned is: This appears to be a subdomain you are adding (1008485)
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My domain was currently setup with wordpress.com and I have just updated the nameservers to point to NS1 INFINITYFREE COM and NS2 INFINITYFREE COM.
The domain validation pass, but when trying to add the domain I get the error.