I do not have a sample for Service Desk Plus but, based on the docs, your json doesn't seem to have any problem. Usually when I need to troubleshoot this kind of integrations I use postman to do the requests since you can get more details from the API response, than you get from the SOAR connector results since there might be some code logic to handle the response. If you test with postman and you get the same kind of problem, that rules out SOAR. From what I saw in the servidesk plus connector, I don't think the problem in it since there is no default. It just uses whatever you put in the fields parameter. I would check if you need to include in your json the "id" field alongside with the "name" nested in the "template".
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