hi - do you have Cubase 11 still installed on your system ?
can you try running that first ?
what version of the Steinberg Activation Manager are you using ? and when did the problem start ?
I’m wondering if this is related to the bug that was pushed on us via the latest Steinberg Activation Manager forced update ? (fix for that is promised early next week)
pinging @Ben_at_Steinberg who may be able to confirm