This is not a message from McAfee but rather a website abusing the toast notification/popup feature in your Microsoft Edge web browser to present you with scam messages. In this case, the abusive site is desktopnotificationshub[.]com, according to the provided picture.
Here is how to disable these popups in various web browsers:
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Notifications which pop up on your screen can be distracting and annoying. Here's how to disable them in the various web browsers (current as of December 2021):
Google Chrome (Version 96+) Enter chrome://settings/content/notifications to open the Notifications settings page in Google Chrome. Remove all non-google.com domains from the Allow section. Toggle the Don't allow sites to send notifications option to on.
Instructions for Version 88 and older: Select Settings → Advanced → Site Settings → Notifications from the main menu, and change "Ask before sending (recommended)" to Blocked.
Mozilla Firefox
Select Tools → Settings → Privacy & Security from the main menu, scroll down to Permissions → Notifications, select Settings, click on "Remove all websites" and then check (select) "Block new requests asking to allow notifications" and click on the Save Changes button..
Microsoft Internet Explorer
(does not support notifications)
Microsoft Edge (legacy version)
Open Windows Settings app (not Edge's) and go to System → Notifications & Actions, scroll down to Notifications, and set "Get notifications from apps and other senders" to Off.
Microsoft Edge (Chrome-based, Version 91+)
Go to edge://settings/content/notifications in the address bar and disable Ask before sending (recommended). If there are any entries in the Allow section, click on the ⋯ menu and select Remove for each one.