If notifications don’t work with the @username style (especially for usernames including spaces), you can alternatively use the @userid format. The Slack member ID can be retrieved by first navigating to your Slack profile in the upper left-hand corner of the Slack UI:
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Click on your profile picture
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View profile
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More
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Copy member ID
Enter this ID prefixed with an @, e.g. @U08CWUG2F into the notification configuration. Notifications should now work.
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