Signia Pure C&G AX hearing aid MFi pairing and Bluetooth issues

picas answer is correct for Bluetooth-only devices

if it were able to work for you, the way you fully pair MFi hearing aids is to use:

Settings > Accessibility > Hearing Devices

...and at the top of the pane, you should see names of devices available.

if not already showing as connected, the proceed arrow > will open a pane for pairing your devices as you remove them from the charging case.

Next, you need to activate your HearingAid App, and if the devices are still not shown as connected there, use the device-makers instructions to pair again. This is likely very similar, but not identical way you paired before.

You may need two passes to finish this part of the pairing

Basic Pairing Steps

Power Off Hearing Aids and place them in the charger.

Ensure Bluetooth is turned on.

go to Accessibility MFi Hearing Devices

Turn on your hearing aids and wait for them to enter pairing mode.

Look for your hearing aids in the list of devices and select them to pair.

go to Accessibility MFi Hearing Devices

My advice was for MFi hearing aids.