It seems the API accepts email addresses for some user fields but not all. Can anybody help me understand this a bit better?
From my testing "Raise On Behalf Of" accepts email addresses, single user-picker fields accept email addresses, multi user-picker fields accept email addresses.
However "Request Participants" does not accept email addresses, only account IDs.
Is this expected behavior? Is there any way to pass an email address into "Request Participants" rather than having to pull the users accountID before passing in the request?