According the the FAQ in the Overview of the game Jam--
`Q: How do I form / join a team?
Participating in a team is an informal process. You can find others to team up with from the jam community forum, one of the course Facebook groups, or the GameDev.tv Discord. Note that only one person on the team will be the one who submits the finished entry. Other team members can be listed in the entry description to give credit. Also remember that the team limit for a single team is 6.`
and
Q: If I'm on a team, do we all get a free course, or just me?
Yes! The team limit is 6, so make sure your team is 6 or fewer people. But other than that, the primary submitter will receive a message about how to claim their free course, and in that message there will be instructions for your team as well.
so, I suggest making sure that there are names and links to itch profiles included in your game's page so that folks can see who was on your team and then making sure that your claim message is properly filled out after the Jam is completed.