How do I navigate to a project (collection of repositories) and grant access to another user/group for just this project? So far, I can only figure out how to grant access to all repositories owned by the team, which are organized into several projects.
Are you trying to do this for Bitbucket Cloud or Bitbucket Server (the on-prem version)?
For Bitbucket Server it's pretty easy: project --> project-settings --> project-permissions. Full many-to-many is implemented, and so any combination of groups and users can be assigned to any project. Note: once you've assigned a group/user permission at the project level, you cannot further revoke or narrow the permission at a deeper (per-repo) level for the same group or user (or affected user thanks to group membership).
For Bitbucket Cloud I don't think what you want is possible (which I don't use so my advice here is all based on 15 mins trying things out). I suspect there's a strict Team --owns--> Projects hierarchy. Every project under a given "Team" will be accessible to every member of that team, though each team can be further divided into groups, with group overlap allowed. The 4 main permissions can be assigned to each group (Admin, Write, Read, None).
To setup or manage teams: View Profile (bottom left corner icon) --> Teams --> [select the team you want to mange].
You're probably stuck with whitelisting each individual repo for the user you have in mind. Sorry, that's going to be a lot of clicking!
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