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From the discussion in the comments, it appears that the original ask has been resolved. The other issue being asked is about why there's an issue with TypeError: Cannot read property 'preventDefault' of undefined

In InviteCard.js, you need to make sure to pass the event through all the way. Or in your Invitees.js handleSubmit code, check to see if event is defined before calling preventDefault (which you can do using Optional Chaining: event?.preventDefault())

The filter function on an array expects the predicate function that's passed in to return a true or false result and the call to filter then returns an array with the filtered down values.

The inner filter isn't really what you're looking to accomplish since you need to return a boolean, not an array. You want to just determine if every value in the member list doesn't match your private team id. For that, you can use the every function on an array:

Some of the objects don't have a membership property so you should use a null safe operator: user?.Membership[0]?.teamId

Or do user.Membership && user.Membership[0].teamId to guard against undefined