The grant type used for communication between ION and ION API is Password Credentials but for some reason the X-Infor-Identity2 and Tenant information is null in the EAM Oauth Authorization map. Therefore, there are two options to proceed. And this is applicable for On-Premise version only as we are going with Non-Infor suite of ION API.
For cloud EAM this will be handled by ION API only.