Hey @Emmanuel Savaidis - let me explain how subscriptions work in Trello.
Trello is moving to a model where all boards need to be in a Workspace. Upgrading a Workspace is the primary way of upgrading to a paid plan in Trello, and free workspaces can only have a maximum of ten boards open at a time. When you upgrade to Standard or Premium, all users that are considered billable within your workspace will go towards your monthly or annual bill.
Billable users in Standard and Premium are the following:
- Users that have been added directly to the upgraded workspace
- Multi-board guests: users that have been added to two or more boards in the upgraded workspace
Single-board guests - users that have been added to one board in the workspace - are not considered billable users. You can read more about how billing works with Standard and Premium here: https://help.trello.com/article/855-how-billing-works-with-trello-business-class
If you want to upgrade your board, you'll need to upgrade the workspace your board sits in.
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