Hey, thanks for the detailed report and the screenshot. It makes it clear what’s happening.
We can reproduce this bug. On iPad Safari, the bottom of the agent page gets clipped, so the submit button ends up outside the visible area. We’re already tracking this on our side, and there are a couple related reports too:
I can’t share a specific ETA for the fix yet. Once we have an update, I’ll post it here. For a temporary workaround, switching Safari to Request Mobile Website can help, or using Split View or a smaller window until the bottom becomes reachable.