Lightroom is 'unable to connect to network'

Hi,

After migrating my MacBook Pro to a new MacBook Pro, my Lightroom won't sync/download my photos to the Lightroom app (on that new MacBook). I can see all of them when I login online, so they're still there in the cloud, but somehow Lightroom can't connect to the cloud/server. I get this message in the settings:

All software is up to date (according to Creative Cloud) and of course my internet connection works perfectly. 

Anyone had this issue before or knows what I can do to solve this?

Thank you!

Patrick