What should I do if I test my Slack target and get the error Error during transmission: HTTP client call failed?
This error typically occurs when editing or reviewing the Slack target under Settings > Extensions > Targets. The Slack integration uses OAuth to authentication Zendesk with Slack to allow Zendesk data to be posted to Slack.
However, URL targets have the option to include Basic authentication credentials (username and password) which is not required for this target. When entering these credentials and testing the target, this error is displayed but the integration should be working as expected.
If Zendesk updates are not posting to Slack, it is recommended to uninstall, then reinstall the Slack app under Admin > Apps > Manage. If you find that updates are still not pushing to Slack, submit a ticket to firstname.lastname@example.org for further investigation.