This support page for DMC may help.

How to configure Dell Mobile Connect for Android

Thanks so much.  I went through the link carefully, but none of the suggestions help.  The phone and PC are connecting via Bluetooth.  But the program keeps giving me a message suggesting that calls are being routed elsewhere through Bluetooth, which prevents using DMC.  I have tried stopping/disabling every other device (headset, smart watch, etc.), but to no avail. 

I'm flummoxed.  Again, any help would be appreciated.

-Andy

@anrklein, maybe you are connecting your computer to an extra bluetooth device, like a speaker. certanly I sometimes ran into this problem, and today I disconnected both my bluetooth speaker and my phone, reconnected only the phone, and gained access to phone calling capabilities. worth giving a try

This solved the problem for me. I had a bluetooth headset connected to my laptop which was stopping dell mobile connect to show the error message for calls.

Please write to us on our support channel @DellCares and Direct Message us for further communication

Also having the same issue
Moved to Dell Mobile Connect from another app as I was told it DID support bluetooth headsets
My laptop can support dual connections so not really sure why this cant be made possible

Is there a workaround or is it genuinely not possible?