Visited on May 20 and did a short charge with M-CHARGE RFID. No issue.
There's an M-CHARGE sign at the first fork between 1.UG and 2.UG, but there isn't any at the next fork on 1.UG. You need to go right at the second fork (continue straight). The chargers are in the north corner of 1.UG. This is the opposite side where the SAK chargers used to be.
When I arrived there was a pile of shopping carts on the leftmost charging space. This was the Migros staff collecting carts before loading the employee lift whose access door is in the gap between the charging space and next regular space.
They also added an M-CHARGE logo on the totem with all the shop names outside. I only noticed this later and didn't take a proper picture. We see it in the background of my Shell Recharge pictures.