Q: Why Blue tooth is not working

could be an issue with expectations

these are the profiles ios support

iOS: Supported Bluetooth profiles - Apple Support

these are all the profiles there are

https://en.wikipedia.org/wiki/List_of_Bluetooth_profiles

many bluetooth devices require the user to put them in pairing / discovery mode before they can be connected to a new device

read the manual of the device in question as to how you go about putting it into pairing mode