Hi @vf Thanks for reaching out. service names are globally unique, if the name is not available you need to try creating a namespace using different name.
you can also verify the availability of names while creating a namespace via a rest api call https://learn.microsoft.com/en-us/rest/api/servicebus/stable/namespaces-check-name-availability/check-name-availability?tabs=HTTP
I had already verified for the given name "myuniquenamepsace" and could see the name is already in use.
{
"nameAvailable": false,
"reason": "NameInUse",
"message": "The specified name is not available. For more information visit https://aka.ms/eventhubsarmexceptions."
}
please let me know incase of further queries, I would be happy to assist you.
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.