why won't my cron command work?

I have manually added a command to my crontab file (Monterey 12.6.9). Pretty simple; the crontab entry is something like:

0 10 * * * mv /Users/me/Desktop/test /Users/me/Desktop/test2

Which means, at 10am every day, do this rename. But it simply doesn't work. Other commands in my crontab file work fine, which suggests that cron IS actually executing. I HAVE given the cron app "Full Disk Access" in Security & Privacy. That mv command works fine as a terminal command. Not sure where the cron log is, so I haven't pieced together what is happening. This is confusing. Advice?