Recipient Setting Does Not Work With Display Name

[theory]

The Slack plugin works fine when I specify a channel, but I get a 404 when I specify my slack username via the recipient setting. Is this a known issue? From Slack’s docs, it looks like prepending @ may not be necessary. But maybe it’d be better to add a channelID setting to the plugin, and then one can specify a channel ID (e.g., C123456) or a personal ID (e.g., D05MQH3Q2DP)?

[theory]

Originally posted pin the Harness Slack, after following the comment to open an issue yesterday and following the link to discourse, which redirected to Harness.

[theory]

Turns out that I had the wrong username. My company set my username to david.wheeler, but I changed my display name to theory years ago. Nowhere in my profile does it say david.wheeler at all that I can see, yet when I used recipient: david.wheeler, it actually worked! Completely wild.

I do think that having an option to use IDs would be less ambiguous, however, and allow for things like name changes (channels or people) not to break message delivery.