Using New Outlook on Windows for personal email, calendar, and contact management
I spoke to Spectrum for the third time last week and they reminded me that I had an IMAP admin email address on mail.twc.com. I tried adding the admin email address to my New Outlook app in Win 11 and it did work though there were no email entries to this unused address. I then tried to add my legacy IMAP address through mail.twc.com and to my surprise, it loaded and fully populated the email content and my calendar. I was elated to have found this trial-and-error resolution on my own (kudos to the Spectrum agent for the admin email reminder though he said that "we're working on it").