Solution :-
1. Search for the domain in the H-Sphere control panel, if you are able to find it. The same domain can’t be added in multiple accounts in the same cluster.
2. If you are not able to find the domain in the H-Sphere control panel and the domain being added is a service domain, make sure the client is choosing Register as a service domain option while signing up against the service plan.
3. If you are not able to find the domain in the H-Sphere control panel and the domain being added is not a service domain, then this is happening due to a ghost domain entry in the H-Sphere database that needs to be deleted from the H-Sphere database.
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