Hammerhead and Shimano no more.
Apparently, Shimano iis not happy that SRAM purchased Hammerhead and has told Hammerhead to discontinue the capability of the K1 & K2 devices to interface with Di2. HH will change on the next update to lose the ability. Sucks If I were HH I would just ignore it.
Shimano cuts Hammerhead integrations after SRAM acquisition | Cyclingnews