Tier 12

In Forza Hub TIER 12 on Forza 7 shows only 11. Weekly credits the same as TIER 11 - is it correct ?

You should be getting 500k every week for Tier 12. There is an issue with this, a delay in receiving the proper rewards. Best thing to to do is stay patient and wait until it catches up.

I’m tier 12 and have been getting 425k for weeks

I reached tier 12 shortly after the game released and am still receiving 425k. But others have reported getting their 500k after a while so it is possible.