I had the same problem in January/February 2023, and they never did give me the $50 (two coupons at $25/ea) rebate.
Had numerous emails back and forth with the Phillips company and they said I did not include a valid UPC number. But I did, because I cut it off the box. Good thing I made a copy and I sent them that to prove I had sent in the correct item. They never gave me the money and they stopped replying to my requests.
Now when I order something and there is a rebate offer, I ask myself if I would want it at the price that is being charged, even if I don't get the rebate. If the answer is yes, then I go ahead and purchase the item. At least that way, I don't have any regrets.