Bluetooth headphones not connecting to iPad Air 5th Gen

I’m using the iPad Air 5th generation. I’ve tried connecting TWO headphones to it but neither works. First one, is a logi, which works fine and connects to my sister’s MacBook. second one i tried was JBL, which also works fine and connect to my younger sister’s iPad 10th Generation. It seems like whenever I’m trying to connect these headphones, I turn on my Bluetooth, turn on the headphone, and the Bluetooth section thing in my iPad just keeps loading and shows no devices. And no, when I’m trying to connect these headphones to my iPad, they aren’t connected with the other devices. What can I do to solve this problem?

[Re-Titled by Moderator]