How to set user story team?

In VP we have a default team. Some user stories have a team entry in which “Default team” is set. Other user stories (most of them) do not have this. Those user stories cannot be seen in all those views where you need to select a team as filter.
E.g. in the sprint story board I am not able to see all user stories of that sprint and thus cannot easily set those to finished.
How can I set a team for a user story?

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