Jbl extreme will not pair with my iphone 13 pro

If this is a Bluetooth speaker, check the manual to ensure that you have placed the speaker into discovery/pairing mode. If you have paired this speaker with multiple devices in the past, it is possible that the speaker cannot pair to more that one device without being reset; however, the manual should provide you with that information.

Did you read the manufacturer's manual before purchasing this speaker?

You're welcome. Glad you got it working.