Hi again
I found out why this is happening.
That exclamation mark means that Canvas tried to reach the email address listed, but was unsuccessful so we put the email on a bounce list so that it does not get put on the AWS suppression list.
In our case this has happened because we created the Canvas accounts before the email address was set up, so when Canvas attempted to send an email out soon after the account was created it failed because the email address did not exist yet.
To fix this you should:
1. Go to "Admin Tools" and click on "Bounced emails" Tab and get the list of all the emails that have been bounced.
2. You need to confirm the active emails internally in your organisation first.
3. then you should reach out to Canvas Support and send them the users list and if you have confirmed that their emails are working they can get them removed from the bounce list.
Please see the attached screenshot.
Hope this helps.
Regards