Not syncing

Lightroom Creative Cloud - Desktop Windows app - Version 9.0

The Lightroom App fails to upload new photo's after importing them or new adjustments to the cloud. Photos imported through the web app or mobile app do download on desktop, but the other way around does not work since October. 

I tried:

- Restart app and computer

- Deleting the syncing photos and import them again. 

- Forcing a sync by making a small adjustment to an already synced photo without importing other pictures

- Deleting the lightroom app and re-installing it

Could you provide a solution for this issue?