The dodgy extra mining protocol put into the S9s purely to work with antpool. Solo doesn't have code to ignore the extra protocol data from those S9s and rejects them as invalid shares. Looks like they have the very early S9 firmware or something like that.
this shitty bm

Thanks for the explanation anyway...
Well, then instead of the lottery this s9 will add to my regular hashrate at KanoPool for a couple of hours...
Good for me that I always rent a bunch of different machines for 4-5 hours and not the only one for a day, so some part of lottery hashing goes on))