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@limited-carpenter-34991 Appending "https://management.azure.com" solved the issue, but I still didn't manage to associate it with an api. Did you manage to do it?

I can create a backend but the type is not an azure resource reference and it is a little bit confusing that inside an azure resource backend type the service url is required too, because inside the azure portal in api management the service url is disabled when you choose the azure resource type for a backend. @rhythmic-vegetable-87369 any ideas ?

Same issue here. Unless it is a http end point, I'm unable to reach it through the backend as well.