issue installing on MacOS Monterey 12.2

After setting up a new macair macOS Monterey 12.2 I have had all my local files copied across from my old macair. I had to install Dropbox app to synch my selected local folders and files with Dropbox cloud .

I am getting the below error 
“Couldn't start Dropbox
This is usually because of a permissions error. Storing your home folder on a network share can also cause an error. For more information, click the help button below.”

I found a hint from Jay in the Dropbox forum
“ on update (macOS 12.0 and above), some stricter permissions have been enforced by Apple which have probably led to the issue you are experiencing.
 
The following steps should help to resolve this behavior:
 
1. Click on the Apple icon in the top left hand corner of your screen
2. Select "System Preferences..."
3. Then "Security & Privacy"
4. Select the Privacy tab
5. Select "Full Disk Access"
6. Under Dropbox, ensure that all the folders are checked. (To make changes, you will need to click on the lock icon, and enter your macOS password)
7. Repeat these steps under 'Files and Folders' and 'Accessibility'
8. Once you've completed this, please attempt to restart the Dropbox desktop app

If need be, a reboot of the Mac itself would also help. “

I have done all and nothing is helping.
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