I have a 2004 manual transmission Audi S4 that periodically won’t start. All battery function is up and the console message reads ‘must depress clutch to start’, but there is no turnover. It’s been in to multiple mechanics with no solution. Latest fix was to replace the clutch switch. Still have the problem. Sometimes it will start 10 minutes after the failed attempt, other times it’s been a day plus.
Not sure however google is likely your friend: