Custom GPT: the headphones icon is gone when I switched from iPhone 14 to 15

On iPhone 14 Pro Max I had voice (the headphone icon) both for ChatGPT and custom GPTs.
On iPhone 15 Pro Max I have voice for ChatGPT BUT NOT for custom GPTs.

  • Permissions are OK
  • I tried to reinstall.
  • I tried to change voice
  • I am using the app, last version 1.2024.017 (18507)
  • On MacBook I don’t get voice at all but this is fine (expected?)

Still doesn’t work.