Not a direct answer to your question but you may not even have a green code. When I left quarantine in Shanghai (at the time the requirement was simply 14 days) my QR code turned out to be red and I only found out when I got to the check-in desk at the next hotel.

Luckily they accepted my end-of-quarantine certificate and negative PCR result that you get just before you leave quarantine.

I then appealed through the AliPay app (apparently a false red code is a regular occurrence) and the code turned green the next morning.