A common issue is not having the Last Name and Email attributes configured in your SAML Set Up. To diagnose this:
1) Make sure EZOfficeInventory is getting the Last Name and Email for members. The relevant options are available under Settings → Add Ons → SAML.
2) Look for typos in the SAML Attribute Names added in EZOfficeInventory Settings. For example, if your SAML Attribute for the Last Name is last_name, it should be entered as such.
3) In most cases, the parameters/attributes are mapped in your preferred identity provider configuration settings. Otherwise, your service provider will ask you to map them.