How do I change the Support Email of a Firebase Project?

Question

How can I change the support email in my Firebase project under
Settings > Your project > Public settings > Support email

Answer 1

That setting doesn't show for all project it seems. But when I found it, hovering over the ? says:

This will be the email address presented to users when they are authenticating with Google. It can be changed to your signed-in email or an email of a Google Group managed by you.

So it looks like you'll need to:

1. Create an email or google group (possibly on your own domain).
2. Add it as a collaborator.
3. Sign in as that collaborator.
4. Select that email address.

Step 3 might not be needed, since I can also see the email addresses of team mates in my test project.