Art,
Once I go to the "Upgrade" tab, it appears that I am missing the
"View ? Change Plan" tab.? I see it in another group that I am the
owner of.? See image.?
That's ... odd.
Contrary to what Peter said, if you are an owner of the group then
you already have the Billing Permission (and all others).
To confirm, when logged into Groups.io, and looking at that
group's Update page, what badge do you see next to the
Home button?

If it says Mod then you aren't an owner of the group, or
at least aren't logged in with the email address which is an
owner.
Otherwise I'm not sure what's going on. I thought the way you made
yourself payor was to use the View/Change Plan page to pay for a
billing option. And the only way the question of whether or not
you're the payor would come up is if someone else had payed to
upgrade your group. But your screenshot shows that the group is
still on the Free plan.
So in your shoes, if you are logged in as an Owner and no
one else in GMF comes up with an explanation I'd be inclined to
send that screenshot to [email protected] and ask
"How?"
Shal
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