I also didn't receive my h2h reward at rank 1 until many supporting screenshots and calls with EA. Not the most ideal solution for the player, but take screenshots of anything to provide. For example concerning season 8 having the screenshot of not only reaching rank 1 but particularly a screenshot of the red notification which states "...hold your rank to receive" end of season reward was pivotal in resolving the issue. Also after two days speaking to EA make sure you only use one device if you don't want this potential issue. Last season (8) the issue seemed to be that I played the game on multiple devices - I have 2 iPads and 2 iPhones) which created the error since each device was also connected with Facebook.
If you switch devices or play only on one make sure to disconnect from Facebook within the ufc app instead of just closing out the app to avoid confusion. I understand not the most ideal solutions but again: take screenshots, use one device, or log out when using multiple devices. I hope this helps. Thank you.