Cox Primary/Parent Email not accessible via Outlook 2016

This problem started today (January 24, 2018).  Cox had a message on its website >> Cox doing maintenance on some email accounts.  I have several cox email accounts.  All of them are working with Outlook 2016 except my primary/parent email address,  The error message that I receive from Outlook is basically that your email server rejected my logon; check logon & password; server responded: ERR – account is temporary unavailable.  This error only occurs with my primary/parent email address.  All of my other Cox email addresses are able to send/receive emails.   

 My primary/parent email address is apparently still on the old legacy Cox servers.  All of my other Cox email addresses have migrated to the new platform and are working just fine with Outlook 2016.  I chatted with one of the Cox Level 2 Technicians earlier this morning and he acknowledged that the problem was with Cox and not on my end.  I experienced a similar problem several months ago which was eventually fixed by Cox. 

I have verified that all of the email settings are correct along with the log-on information.  I have been a Cox customer for more than 10 years and this is very disappointing that this issue has occurred again.  Is there any resolution to this issue?  It appears to me that for some reason the Cox servers are blocking my logon for this email address.  Surely, there must be a way for Cox to remove this block, or to reset it which was done last time this problem occurred.