Can't connect to my shared company

SOLVED

I tried to open my company today, which is always a shared company; but there was an error.  So when I tried to "connect to a shared company", typed in my email & password, I received the message "we were not able to retrieve the list of shared companies for your login."

I have never received this message before.  I restored my company from its last backup (which was yesterday), but its clear the company is no longer shared.  How can I access my shared company again?