I continue to have the same problem, and neither Dropbox nor my company has a solution. I have no more than 300,000 files, and I've tried everything. I've received over 80 messages from Dropbox support, and they still haven't resolved anything. It's incredible that this is happening after two years and they haven't resolved anything. It depends on my company, but if it weren't for that, I would never use Dropbox. The worst user experience I've had so far.
https://www.dropboxforum.com/discussions/101001016/not-eligible-for-dropbox-for-macos-12-5-or-later/693655/replies/752171