At what level is the 5 report limit enforced?
You may have 5 reports active at any time per master account, per user, regardless of the license keys used. This means that if 3 users manage 1 account, each can have 5 active reports, for a total cap of 15. If 1 user is managing many master accounts, they are allowed 5 active reports per master account they manage. Remember that reports are first-in first-out, so adding a 6th report removes the 1st. The limit is shared through the UI and the API.