class Example(models.Model):
    _name = "example.model"
    
    team = fields.Many2one("maintenance.team", "Team")    

    @api.depends("team")
    def _team_member_ids(self):
        print(self.team.member_ids.ids)  # this correctly prints user IDs for users set in that team
        # below domain however returns nothing
        return [('user_id', 'in', self.team.member_ids.ids)]

    work_shift_lines_ids = fields.Many2many("hr.employee", relation="shift_one_relation", domain=_team_member_ids)

I would expect this to work but my field work_shift_lines_ids does not offer anything when I select it. 

I expect it to filter only those employees that have user_id in team.member_ids

I checked both models, this is how built in maintenance.team model defines member_ids:

class MaintenanceTeam(models.Model):
     _name = 'maintenance.team'
     

    # some other fields...
    member_ids = fields.Many2many(
        'res.users', 'maintenance_team_users_rel', string="Team Members",
        domain="[('company_ids', 'in', company_id)]")

As you can see member_ids is just Many2many to res.users so when I did self.team.member_ids.ids it will just give me list like [2, 24]  (this works I tested).

For the first part of domain, where I did 'user_id' , my logic is since work_shift_lines_ids is defined as Many2many hr.employee model and hr.employee has user_id field it will take that field and run it trough self.team.member_ids.ids.

I also tried 

[('user_id.id', 'in', self.team.member_ids.ids)]

but again nothing is showing in selection.

I also declared my domain with @api.depends("team") as I would like it to get updated when team changes, not sure if this works since I can't test because my domain is broken but is this logic correct?