P: Can't authorize to share pictures with Facebook

See the smilie? Got a sense of humor?

Look, I'm not trying to put down any criticism, but let's be realistic here. There's two big companies working together - or not, as the case may be. Interactions break from time to time, often due to API changes introduced by Facebook, such as in this case. The fact that it's only affecting some users (yes, it's working for me, I just tested) suggests the same has happened in this case. We've seen the same in the past with changes Google made server-side that broke Lightroom Classic's Map module. When you get multiple companies working together, stuff gets broken. 

The good news is sharing on mobile is still working, as is saving to the hard drive from the desktop, so it's not quite so convenient but you can still do your work.

I agree and have moved to CC for the same reason. In fact, having not used CC for very long I hadn't noticed that there was no watermark feature! Even though a sort of 'spin-off' from Lightroom Classic, it will probably take time to implement everything. As long as it all works as intended is the main thing of course.

Classic is amazing...but I migrated to CC for a cloud base solution. I just need graphic watermarks and I'll be happy. CC definitely improved my workflow!

They probably are. I'm sure in time Lightroom CC will be a truly nice piece of software and many users may migrate to it from Lightroom Classic.

We haven't had an update in a while...I hope they're working on stuff like graphic watermarks and fb uploading and stuff.

I don't think 4c is a fair assessment. Looking at the number of complaints, I wouldn't call it a 'small' feature either.
But as a Lightroom evangelist, you'd have to put down any criticism of the product I suppose. 

Tell me Victoria, is the Facebook upload working for you?

Let's see, that's 1 small feature out of a few thousand, so that'd be about 0.0004¢? Oh, and half that, because there's a good chance the problem is at Facebook's end. 😉

I assume we receive some form of discount seeing as we are not being delivered a full working product?

Same problem. Just as the problem remerged from 2017 (https://forums.adobe.com/thread/2314504?start=40&tstart=0) I imagine the issue is in the email address adobe uses with Facebook to enable the plugin manager. Hopefully it's the same problem and a relatively quick fix as before.

Still have this problem as well