Alexa bluetooth pairing to up2stream issues,

As per the title. Has any successfully paired bluetooth Alexa to an up2stream? I have the Prov4 and the 2.1 and both are not able to. The alexa continuely searches but doesnt find Up2stream. I can see the Up2stream is available from my other mobile device but for some reason Alexa cannot “see” it.
Can anyone shed light to this?
Many thank in advance.