When you see the message "Did you whitelist following IP addresses on your exchange" with a yellow triangle icon in your Troubleshooter, don't be alarmed. This is a standard question that appears for all users, not an indication of a problem.
This message is always visible in the Troubleshooter section as a routine checkpoint, regardless of whether you've already completed this step. The yellow triangle is simply an indicator for the question type, not a warning that something is wrong.
To clarify: the presence of this message does not mean you haven't properly whitelisted the required IP addresses on your exchange. It is good to check it if you're not sure.