How to sign up individually as members of the same developer team?

I'm considering signing up for visionOS developer labs to test the integration of ARKit on VisionOS. The webpage says, "We recommend one designer and one engineer attend the lab. Each member will need to submit a request separately for the same day and location." I, as the primary account holder of a developer account, can sign up for the lab, but my teammates who are already assigned an "admin" role in my account but not the primary account holder can't see the sessions at all and can't sign up.

Any recommendations? Do we all have to pay $99 to attend the lab?

How to sign up individually as members of the same developer team?
 
 
Q