Ion Plunge not visible in Bluetooth device list

I have a Ion Plunge and I can't see it in other device's bluetooth search... it paired perfectly with the 2 first devices I used it with and now it won't show up anymore in other device's bluetooth search even if the 2 first devices are disconnected. Ive tried to reset the speaker by holding the bluetooth button 5 seconds, I also tried to "forget the plunge" on my 2 devices bluetooth but nothing works. So now I have a bluetooth speaker that will only sync with 2 specific devices... I have to use the aux input for my friends to put music so I can not use it in the pool. Please Help, its very annoying.
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