First of all, this forum is for desktop flows, but your question is related to cloud flows. Cloud flow questions should be posted here: https://powerusers.microsoft.com/t5/Building-Flows/bd-p/BuildingFlows
For what it's worth, the "Forbidden" response means that the user you are using for the Dataverse connection does not have the required privileges to perform this task. It likely does not have access to the specific resource. You should check accordingly.
-------------------------------------------------------------------------
If I have answered your question, please mark it as the preferred solution. If you like my response, please give it a Thumbs Up.
I also provide paid consultancy and development services using Power Automate. If you're interested, DM me and we can discuss it.
