Cannot connect to review server *after* successfully publishing -- help!

This is following on from a couple of earlier threads.

Desktop - Running Acrobat Pro DC Version 2019.008.2074 and Acrobat Reader DC Version 2019.008.2074

Notebook - Running Acrobat Pro DC Version 2018.011.20063

SME is running Acrobat Reader DC Version 2019.008.2074

1. Desktop - Initiate shared review using sharepoint server. Send review to myself and to SME.
2. Review request received (in Outlook) by myself and SME.
3. SME opens pdf without problems with Reader. Notebook opens pdf without problems with Acrobat Pro. Desktop attempts to open and gets "Adobe Acrobat cannot connect to the Review Server: 13.107.136.9"
   (Note: earlier in the day, after this started happening, I was able to connect to *1* of my existing shared reviews. After I shut down Acrobat and restarted, I was no longer able to connect and got the error above.)
4. SME and Notebook can both add, publish, and check for new comments.

So, in a nutshell... I can initiate shared review from my desktop, but cannot subsequently check or publish comments. Other reviewers, however, can check and publish.

I'm at a loss. Any insights would be greatly appreciated.