Cannot Add New User to Release Channel (Meta email vs. Oculus email?)

Hello, we are developers of a VR app. When we tried to add a new Meta account email to our app's Release Channel on Oculus Developer (https://developer.oculus.com/), we got this message: "We couldn't find anyone with the Oculus email."

This email is a newly-created Gmail that has just signed up for a Meta account on https://auth.meta.com/. This email is not a Facebook account.

Did something went wrong, or is there a step missing? I thought by registering a Meta account, this email is already an Oculus account.