I am trying out Advanced Roadmaps for Jira Cloud. I wanted to get team sprints to show in the timeline. Based upon my reading, it looks like you need to have the "team issue source" assigned for sprints to show up correctly. According to the following article:
https://support.atlassian.com/jira-software-cloud/docs/associate-a-team-to-an-issue-source-in-advanced-roadmaps/
"When you add a team to your plan, you need to indicate where their work lives in either a project, a board, or a filter."
However, when I go to the Team Settings to change the issues source, all I see in the dropdown are a list of the Jira projects, not boards or filters.

Am I misunderstanding what is written, or is something missing?