Hey, I’ve seen your article before and I’m sure you be figured it out by now, but I have a Samsung Tablet A with Android current as of July 2020. It has the old Gmail app with the red M, and the ability to set up ALT email through IMAP.
I went through the instructions on Shaw support for IMAP setup, and it worked right away. No need for Outgoing mail or Incoming mail settings just one IMAP server setting, I didn’t pay close attention to the Security or Port numbers by the Shaw support is currently to in those I believe.
The only issue is the new Gmail App on IOS.
it requires both incoming and outgoing mail settings, and the port and security settings matter. Not sure if POP or IMAP or WM.SHAW Is appropriate for that. But the old Gmail App works fine on Android.