Sounds like your sensors were OK from the start, would have saved yourself some trouble if you had rotated the wheels to the front as originally suggested. Keep the old sensor as a spare if you still have it though
Next step, check connection the the transponder module, which is located to the rear right wheel arch behind the plastic splash back. Unfortunately there is no way of testing this component, you only have the option of replacing it. I have listed a breaker on the link below, you may want to enquire on the price delivered to your home.
To gain access to this component, your rear right side wheel needs to be removed, then using a flat head screw driver you need to undo the plastic self tapping screws, there are several that hold the splash back to the wheel arch. You will also meet 2 or 3 mini hex type bolts, screwed to the rear bumpers, they might be corroded so do spray some WD40, which will make it easy to unscrew.
This ^^^ will be the final step at DIY level. After tackling the transponder to the rear, if no improvement then the fault is somewhere like up front i.e. the SKREEM and that my friend is not a DIY fix because the vehicle will need to be taken to the dealership.
Here the link