Hello there, @Deborah0109 ...
I'm not sure if you are an instructor or a student, but here are a couple Guides that describe what you can do to try and remove the exclamation point next to your e-mail address:
Hopefully this will help a bit. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
I also have this issue. I recently migrated my domain to ProtonMail. I receive emails from other places and Canvas will send emails to other addresses that were also migrated over but not my main, original address.
I'm not sure what to do and those guides did not help correct the issue.