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Last tested: Jan 22, 2019
There are a few reasons for this:
- If the format of the scheduled content is set to HTML, that format is not supported by Slack
2017-07-26 05:02:18.648 +0000 [ERROR|007e6|] :: Looker::Model::OutgoingWebhook::OutgoingWebhookError : Could not send webhook to "https://my_app.com/slack/post/channel/channelname". <!DOCTYPE html>
2. The URL may be wrong. Make sure it includes all parts, especially the channel name. According to lookerbot docs, it must take the form:
https://APP_DOMAIN/slack/post/channel/channelname/
This content is subject to limited support.