Can't enable notifications to messaging apps

I'm trying to get set up to send alerts/update requests to Slack. I am able to get a standard automation rule to send an alert to a channel, but I can't enable personal notifications in messaging apps

I've already:

  • added the Smartsheet for Slack app to my Slack workspace
  • Connected ("Allow Access") my user account in the SMAR for Slack app
  • Checked to make sure messaging app notifications are allowed at the account level (even toggled on/off for good measure)
  • successfully tested an alert to channel via sheet automation

When I try to enable messaging app notifications in my personal settings, all the checkboxes are grayed out. Is there something I'm missing?

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Answers