Printing #10 Envelopes in the Dell 3000cn

Been trying to print to #10 envelopes in my Dell 3000cn printer and all I get  are 3 screens on the printer:

1- Load MPF

     Covers 1

2- Load MPF

     024-969

3- Load MPF

     Envelope #10 

The envelopes are are placed in the printer with the Width (longer surface) stretching front to back with the MPF reduced to the height (shorter surface) of the the envelopes. They are placed in such a manner that the front of the envelope is facing down and the deepest edge is sitting flush with the feed rollers.  I am running the latest dell drivers for this printer on Windows 10 and thus far they have worked fine with all of my other printing jobs.

I would appreciate any help in figuring out why I can't print to these envelopes.

Thanks!

Brian