You can use tons of other Bluetooth mice with the iPad, but Apple’s latest mouse is dead in the water.

Once upon a time, and not very long ago at that, you could use a Magic Mouse 2 with an iPad so long as you were running iPadOS 13. It worked well enough—for a while, anyway. But lately Macworld readers have been telling me that their Magic Mouse 2 no longer works on Apple’s tablet, and some of them have singled out January’s iPadOS 13.3 as the culprit. The most frustrated users are those who never had a chance to see the mouse work at all, so they’re convinced they’re doing it wrong. Surely, they think, Apple wouldn’t pull support for one of its own products—and who could blame them?
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https://www.macworld.com/article/3528863/why-did-apple-drop-support-for-the-magic-mouse-2-on-the-ipad.html