Rogers and the Apple Mail Program Seem to Be Working Again on Desktops!
If you're a Rogers subscriber in Canada, some of you have found that you weren't able to use your Apple Mail program on your desktops (though it still worked for IPhones and IPads) due to some kind of authentication issue. I had purchased a new MacBook Pro just over a year ago and was disappointed to find that I could not use the Apple Mail program that I had been using for years because of this. I had to resort to using another mail program which wasn't my first choice. Tonight I happened to try opening Apple Mail and added my mail accounts and it all worked! Hope it works for others who were having the same issue.
MacBook Pro 14″, macOS 15.5