having trouble sending out email using yahoo.com, had to leave xfinity and using comcast.net is now supported by yahoo.com

The move from Comast's in-house email service to Yahoo is still rolling out. They tell us to wait until you receive an "invitation". Have you? I have not, so I haven't moved on that yet. The first step would be to thoroughly read both Xfinity's and Yahoo's articles about the switch: https://www.xfinity.com/support/articles/yahoo-email-migration-overview https://help.yahoo.com/kb/new-yahoo-mail/SLN36803.html After digesting those, and if you still need to forge ahead, please tell us where the process is failing. Please quote all error messages verbatim and completely. Screen shots of the errors can be helpful.