The “Buy” button in the premium purchase section on mobile does not work and only shows “The purchase failed”. Normally it would’ve shown a Google Play purchase popup. It happens (at least on Android) everytime.
To reproduce the bug, go in the Roblox app, then tap the “More” section then go to the “Membership” section, then tap the “Buy” button.
Here’s a screenshot:
The bug started when Premium came out.