The integration with Trello lets you import all of your boards and users from Trello into Forecast. This is a simple migration tool, and will thereby not synchronize new data on the fly.
Users from Trello will be imported without an email address attached to them, and function as Virtual users until further activated with an email address. This is simply a limitation of integrating with Trello. To activate users, follow the guide below.
Step 1: Go to your Admin Settings, and click App Catalog
Step 2: Select the Trello integration, or click here.
Step 3: Click Migrate
Step 4: Login to Trello, and authorize the connection
Migration of Trello boards and users will begin, and should appear as new projects in Forecast within a few minutes. As mentioned above, new users imported from Trello will function as Virtual users until further activation.
Step 1: Go to your Admin Settings, and click Team Members
Step 2: Find the person(s) on the list, and click each person
Step 3: Enter their email address in Team member's email
Step 4: Click Invite Team Member
Step 5: Continue the process with each person