Mac is not syncing with Dropbox

iMac (Retina 5K, 27 inch, 2019 running macOS Monterey Version 12.5.1 will not sync with current stable version of Dropbox. I also have a MacBook, iPhone 13 pro, two 11" iPads. All of these devices sync with each other and Dropbox, but not with the iMac. I've deleted and reinstalled the Dropbox app several times on iMac, turned off antivirus and firewalls.