Have you contacted Oticon support to see if they can assist you with this?
In the mean time, see if any of the following can help resolve this issue:
- First, double-check that your wife’s specific Oticon model is supported under iOS 26 (Oticon publishes compatibility lists via their “Problems connecting …” support pages). Use the Oticon app (or via her audiologist) to verify the hearing aids’ firmware is up to date.
- Next, try "forgetting" and re-pairing the hearing aids again: On the iPhone: Settings → Accessibility → Hearing Devices (not via Bluetooth settings). Find the Oticon devices and “Forget” them. Turn off Bluetooth on the iPhone. Power off / reset the hearing aids (e.g. remove battery or open & close battery door per Oticon pairing instructions). Then enable Bluetooth, go back to Hearing Devices, and pair them anew. (IMPORTANT!) Don’t let any other device (iPad, Mac, etc.) attempt to auto-connect to the hearing aids until after this is confirmed working.
- Next, try restarting everything: Fully restart the iPhone (power off → back on). If that doesn’t stabilize, you can try Reset Network Settings (Settings → General → Transfer or Reset → Reset → Reset Network Settings). After the reset, go through the pairing process again.
- Finally, disable “Audio Handoff:" In iOS’s Settings → Accessibility → Hearing Devices, there’s an Audio Handoff toggle. If enabled, the phone may switch the hearing aids away if it “thinks” another paired Apple device should take over. Turning that off may prevent unexpected switches. Also, in iOS 26 there is a new “Keep Audio in Headphones” in General → AirPlay & Continuity that is meant to reduce auto-switching of audio among devices. It’s possible this new setting is interfering with how iOS handles hearing aid connections.
If none of the above resolve the issue, Oticon, and then, Apple if needed, will be your next step(s).