Welcome to the Rogers Community Forums and thank you for your post!
I certainly understand the convenience of having your email contacts auto populate when composing a new message. We can certainly look into the reason why this is not working for you.
Did you just recently notice this issue occur?
Are you noticing it with all your email contacts?
The email contact will begin to autofill when you start typing if you have them saved in your contact list. Please ensure your contact list is updated and let us know if that helps.
Looking forward to your reply!