I have the exact same problem, and I also run CS6 on Mojave, and I also bought them from Adobe themselves.
I have contacted them; wasted a lot of time, they asked me for the ID from the pop-up I gave it to them, I gave them the serial number, then they asked for the confirmation email, but I do not have it since it is almost two years old. I went to the bank and PayPal and figured out the company who charged me was "DigitalRiver". Digital River is indeed the legit distributor of Adobe. Digital River can resend the order and invoice if you give them the email and last four digits of the credit card you used for the purchase. But mine is expired and I have now another one, so go figure.... I am still waiting for their answer. But it really pisses me off that they assume I am a criminal, but they don't offer any proof you are using illegal software. I am guessing that all the CS6 users are having similar problems since many of them wouldn't keep emails from 5,4 .. three years ago. I hope is not true but it sure does look like A PLOY FROM ADOBE TO MOVE US ALL TO CC AFTER BEING PAID FOR A PERPETUAL LICENSE. That wouldn't be nice
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