Microsoft Team - In Calendar participant status shows as "unknown"

Hello All,

One of the user in our organization joined recently and when she tries to schedule a meeting in Microsoft Team and goes to scheduling assistance for participant addition. She can see status "Unknown" for everyone she tries to add.

I tried below steps

1) Had her login into web version, same issue shows up there

2) Uninstalled teams, deleted cache from %app data%\Microsoft\Teams

3) Renamed teams older folder in user->local->App data->Microsoft

4) Reinstalled team

5) Installed office 365 64 bit version

6) Downloaded the address book on outlook

7) Created new outlook profile

😎 Enabled / Disabled cache exchange mode.

Still unable to fix the issue, Can someone please assist with it.