Make sure to have enough room in your bank to deposit platinum from the reward system. I double checked yesterday but there's no warning of this before you do so and when I found out about this reward system, I dumbly clicked deposit and I didn't have any space for platinum and consequently, didn't receive the five coins.
Yes sir, I messaged Telamon yesterday before I asked the UOR IRC channel, just posting here because when I searched, nothing came up.