Check which version of Bluetooth the device has. It seems Apple has restricted the new phones from connecting to older versions of Bluetooth. I have a Bluetooth speaker bathroom fan which has Bluetooth 4.0. I had no issue connecting to it with my iPhone XS Max. But my iPhone 12 Pro Max will not connect. Not a huge deal as I still have my old phone and I can use that. Just a little inconvenient. Hope this helps.
Misfitss138
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