Looks like no go with the Athlon 200GE.
It does boot, both windows and Linux as we will see. Here is BIOS (sorry for Iphone pic)
On windows - It returns a 3 (No ECC) on the check in CMD
On Ubuntu its the same, no ECC recognition
Still don’t know about the other Ryzen chips. They might be different. 1950X on a designare works for sure.
this is with these DIMMS -