If you change your plan from the Cloud Option to the Professional plan, the Dropbox account that has joined the Cloud Option DJ team will automatically be invited to the Professional DJ team.

If you change your plan from the Professional plan to the Cloud Option, the Dropbox account that has joined the Professional DJ team will automatically be invited to the Cloud Option DJ team when the Professional plan term of validity expires.

In both cases, check for invitation emails from Dropbox and join the team.