It is not uncommon to receive some mysterious errors with no explamations. Sometimes we are lucky to have an error ID/tracking ID, but this is information is still useless unless Flow developers have an ability to actually to retrieve the error message by ID. Maybe in some cases, it will allow us to determine an issue without creating a ticket with MS Support each time.
Suppose we've received an error while trying to approve/decline something:
Encountered internal server error from the XRM API. The tracking Id is '1d585244-af90-4ca0-9ac8-c338985ba57c'
There is no way to access the message by tracking ID.