My Phillips hearing aids connect well with my iPhone 12 Pro. However these hearing aids, which I purchase this month, does not appear as a device when I try to connect them to my Surface Pro 7. Do you know why it doesn't appear?
Most likely your hearing aids only support the iPhone hearing aid protocol (and maybe the Android one) but like most hearing aids, do not directly support "normal" Bluetooth found on computers and other devices. My last pair of Oticon OPN1 hearing aids were like that and the only way to use them with a computer or android tablet or FireTV or anything other than my iPhone was with a bridge device I had to buy. The hearing aids would be paired with the bridge device and then it was paired with various (up to 15) Bluetooth devices like my laptop or TV.
My current hearing aids support Bluetooth LE Audio which requires a newer chipset and drivers in the laptop (or TV etc) so sadly I'm still stuck using a bridge device until such time as driver support becomes available in Windows 11 on my particular laptop.
Reach out to where you got your hearing aids and they can help.