Can't change membership type

I saw the same issue earlier today but I saw the answer in the community Ultra FAQ.

Since you subscribed through the Google app store you have to upgrade through the DC Universe Infinite Android app.

The upgrade options will not be presented through the web or through the Google Play app. I didn’t see upgrade options anywhere until I updated my DCUI Android app.
Then I went to the Settings inside the app and the upgrade options were there.