I tried reinstalling programs on both devices, laptop and iOSs, and also several times rebooting.. I gave up with this  Update=Resolved-However, all of sudden, even I didn't change any settings from both of laptop and Apple devices, DMC is now working properly.
I am struggling with using Dell Mobile Connect program while trying to connect with my devices, iPhone and iPad pro. Both of them worked well before, but all of sudden I only can see the pop-up of, 'connecting, please wait'. I cannot wait forever only for this :(. Are there any upcoming updates on these problems? Thanks.  
Dell Mobile Connect with iPhone iOS 15 and iPadOS15