Steps to reproduce:

Step 1. Turn on NVDA.
Step 2. Open the Excel document.
Step 3. Navigate to 'Comments' by using 'Ctrl+F6', 'Tab' & 'Right/Left' arrow keys.
Step 4: Press Enter key to activate the Comment button.
Step 5: Navigate to any Comment & activate it.
Step 6: Navigate to '@mention or reply,' edit field, start typing "@" and observe the issue.

Actual behavior:

NVDA is not announcing search suggestions are available after typing some characters in '@mention or reply,' edit field and while navigating on search results NVDA just announcing as "N" and it's not announcing the username and user mail ID.

Expected behavior:

For better screen reader user experience NVDA should announce the Serach results information, so that user can select the desired person and send the comment easily.
For example, NVDA should announces "10 Search suggestions available" and while navigating those results NVDA should announce the user information like name of the person and his mail ID as well.

System configuration

NVDA installed/portable/running from source:

Test Environment:
OS Version: Dev (OS Build 22458.1000)
Application Version: 2111 (Build 14606.20000) (Dogfood) (InnerRing)
Application: Excel
Screen Reader: NVDA

NVDA version:

2021.3.5

Windows version:

OS Version: Dev (OS Build 22458.1000)

Name and version of other software in use when reproducing the issue:

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Have you tried any other versions of NVDA? If so, please report their behaviors.

If NVDA add-ons are disabled, is your problem still occurring?

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?