@Frieda Muralles, After researching, I notice there's an outage of Roblox in November. Not sure if your issue is affected by this. You can contact their support in the following link to see if can get back on your iPad.
https://corp.roblox.com/newsroom/2021/11/update-recent-service-outage
Note: non-Microsoft link, just for the reference.
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