Using classic Outlook for Windows in business environments
here is a workaround. do you have a gmail account? use outlook to use gmail account. once setup, go to webmail for spectrum and open it. go to settings and find the button to turn on forward email. then select your gmail address for forwarding. you will get all gmail and spectrum emails in outlook.
Spectrum no longer supports any 3rd party email clients. did this today and it works flawlessly. BTW IMO use the outlook classic, it has more options than the outlook new