Thanks for posting this question. Apologies for the delayed response from over the weekend. I'm checking on this and will get back to you shortly.
Edit:
Azure Fluid Relay (AFR) does not have special IAM roles.
Essentially, contributor access is necessary for almost all operations. Howto: Provision an Azure Fluid Relay service - Azure Fluid Relay | MicrosoftLearn
I have relayed the feedback internally to our product/content team, and are working on updating the Azure doc.
Much appreciate your feedback on this.
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