What field is Portfolio for Jira considering when grouping by team of the roadmap is enabled?

[Radu Muntean]

I am trying to group my roadmap by Team. Some of the Epics are correctly grouped by the teamlet field but others are not.

For the ones that don't get grouped I don't see any reason why they shouldn't be grouped, the teamlet field is populated as in the ones that are grouped and the portfolio team field is not in both. 

[Radu Muntean]

Definitely team field from Portfolio, it doesn't consider teamlets, so even if the info seems redundant it needs to be present in both places.

Also, in my env, the field "Priority." needs to be populated as well so that the backlog items gets assigned, otherwise I can only see them in the Unassigned section of the roadmap, even if team field is populated.