Was just about to say the same thing. Clear data and cache and relaunch. Others have gone as far as uninstall the app and reinstall and sign back in and it pops up.
If the option won't pop up without an active sim you can go online and get a free 7 day trial of Google Fi. Then you should be able to enroll and street loaded cancel Fi. Also make sure you try clearing data and cache for the members app.
