This is a Flow/Dynamics 365 for Financials and Operations Business Edition problem. I am using the Flow template entitled "Request approval for Dynamics 365 sales order".
I've chosen the proper company, etc. This template works perfectly in my own tenant. When I try to recreate the same process in one of my client's tenants, I'm getting an error message: "errorcode: application_dialogexception user accountant does not have the permission necessary to continue the item. clientrequestid".
Needless to say, I'm logged into my client's system with a user ID named "accountant". This is not the "External Accountant" license. "accountant" is actually a full user with "SUPER" rights within Dynamics 365 for Financials and Operations (Business Edition), and is also an Office 365 Admin.
Consequently, I have no idea why I am getting this "permissions" error, or how to fix it. I've posted this on the "Flow" community forum, as well.
