App-level Impersonation for M365 Calendar In integration

Do I need to use a dedicated Service account to access a calendar from M365 in Zoom Room Resource?

So I get this when I try and Authorize with my Azure admin account. 

The requested failed. The account does not have permission to impersonate the requested user.  

How do I choose a different account for it to access? 

Setting up Zoom Rooms with Office 365 - Zoom Support