Joplin on new Mac can't see prior Dropbox sync

Support
1

New Mac installation does not see / sync with notes from first Mac on Dropbox.

New Mac version Joplin 2.8.8 (prod, darwin), Sync Version: 3
Profile Version: 41
Keychain Supported: Yes

MacBook Air, Big Sur 11.6.7

Entered the sync token from Dropbox in new Mac but no luck.

Please help and thanks in advance.

2

Update: received this Error: Cannot acquire sync lock: either the lock could be written but not read back. Or it was expired before it was read again.

3

It usually means the connection is slow or throttle by proxy or company firewall. You need to provide the full log if you want help with this.