What you are experiencing is how the Marvels work. They cannot be paired with more than one device. Full Stop. I’m highly skeptical of any claim to the contrary, because I experimented with this extensively using my iphone, my android phone and my laptop, not to mention that Phonak admits this how they work. (See below.) If you want to switch the Marvels to another device, you have to pair them with that device, after which the pairing with the previous device will no longer work. You will have to remove the original pairing and then re-pair. After which the pairing with the previous device will no longer work. And So On.
If you pair them with a laptop, in my experience you will have to reboot the laptop every time, although some people claim they did not have to reboot their laptop. It was my experience and also my colleagues experience that under Windows 10, a laptop has to be rebooted before you can use a bluetooth device. It’s also the same with my Opns, although I don’t have to re-pair them with any of my devices to use them, so it’s a minor issue.
My audiologist asked Phonak about this and their response is the following, which I quoted from the email. tl;dr, bluetooth is too hard for us:
From what I read the problem is having multiple devices paired to the Marvel.
It is a limitation, but at this point the Marvel can only pair to one device.
I understand his frustration. The hearing aids have been thoroughly tested, but it is still a hearing aid and at this point in time it doesn’t have all the capacity that a Bluetooth headset device can do due the complexity of sound processing for hearing loss. We are working with a very small chip to fit in a discreet housing that patients will accept to wear as a hearing aid, while trying to provide the best sound quality for different hearing losses, keep the power consumption low, and offer Bluetooth compatibility to facilitate communication. We are still facing some technological challenges when it comes to multiple bluetooth connections.
He is right that in order to pair to another device, you have to forget it from the first device you paired it to.
After receiving this response, I got a pair of Opn hearing aids from another audiologist. They are not perfect, but they don’t have the single-pairing limitation. I asked my audiologist if Phonak intended to fix this issue and told her that unless Phonak would commit to fix this issue, I would return the Marvels. Phonak would not make any commitment, so I returned them. Maybe they will fix the problem, maybe they won’t.