I normally have the Bluetti app set for wifi on iphone and Bluetooth on ipad.
I had turned Bluetooth off on my ipad because of something else I was working on.
My iphone instantly hijacked my ipad’s Bluetooth, I could not connect after turning BT back on, no matter what.
I had to turn BT off on my iphone to restore my ipad’s BT connection.
.
These two are like fighting siblings:
ipad: “It’s MY Bluetooth, not yours.”
iphone: “Oh yeah, we’ll see about that. Just try to connect.”