A Google and forum search does bring up some information about this feature and Samsung phones.
One such thread is Android-Streaming-for-Hearing-*****-ASHA-support-in-Galaxy-A.
I hope this and other resultsvia a search may yield further information for you.
I wish you all the best with this situation.
🌈 Stay Safe & Stay Alert. 🌈
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.
@DavidHa: If you go to Settings > Accessibility > Hearing Enhancements > Hearing Aid Support > Bluetooth Hearing Aid, and follow the on-screen prompts, you should be able to sync your hearing aid to the device. If you're still having issues, check the Google Play Store to see if there is a companion application for your hearing aid, as this may be required to access some of the features you wanted. For further clarification, please contact the hearing aid manufacturer directly.
Can anyone verify the S21 series indeed supports ASHA. The post above from @Davof is the only thing I found on the internet that says it should work.
On Samsung’s site: (https://www.samsung.com/global/galaxy/galaxy-s21-ultra-5g/specs/) below “Accessibility” it reads:
Is that the same as ASHA compatible?