I was hoping that Box Drive 2.25 version would make it working again. But my hope was idle...
In the last months I have been in contact with Box Support, telling me it was a Mac Issue. Ran with Mac Support and then Mac Senior Support through all the possible ways to solve this. Finally, they told me it was a 99,95% sure Box Drive Server issue. It works for OneDrive and iCloud.
Too bad Box is not hearing very well.