Network user registration question

Hello Support,
I have a multi site, with the buddypress forum plugin activated. I only have one site on this. When a user registers, it correctly appears in the network level.

For this user to be able to access the forum on the one site, I must get the username on the network level, then add that username to the site level and give them a forum participant role.

Is there a faster way to accomplish this?

Thank you,