Dell Mobile Connect cannot make phone call

The Dell Mobile Connect is running good on my Pixel 4A with all the app permissions given. The Win 11 version also displaying the Contacts, Messages, Files, Notifications, Mirroring content perfectly from my mobile. But the DIALLER is now working. I'm getting an error as "ANOTHER APP IS AUTHORISED TO HANDLE CALLS. OPEN THE OTHER APP AND DIABLE CALL HANDLING. PLEASE VERIFY THAT MO OTHER APP IS AUTHORISED TO HANDLE PHONE CALLS. THEN RESTART DELL MOBILE CONNECT." There is no other app including Microsoft Phone Link App running in the background. But still the issue persists.

Please provide me the solution.