mikew51920 said:

Lately I've noticed that when I am prompted to increase the rank of a champion that has reached max level the reward of emeralds I'm suppose to receive is not always posted to my account. I play on Facebook Game room on server 2. My account name is mikew51920. Thank you for your time.

There are no rewards for increasing rank.

The Emerald Reward shown is for reaching maximum level and has already been paid into your inventory.

https://prnt.sc/j87qo7

For example:

327+2=329

https://prnt.sc/ktpsao

https://prnt.sc/ktpt6k

https://prnt.sc/ktprh2

Note that the champion has not yet increased rank, but the emerald reward has been paid