Slack – How to fix ‘/asana failed with the error “user_not_visible”’ on Slack

Complete the following steps to completely remove the Slack/Hangouts integration.

1. Go to your Slack URL for service integrations: https://.slack.com/services
2. Under Google+ Hangouts click the hyperlinked "• Easy creation of..."
3. On the left side click "Remove Integration"
4. Click OK on the popup
5. Close Slack
6. Go to https://security.google.com/settings/security/permissions
7. Revoke Slack's permissions to access Hangouts

Note: Each Slack/Google user that setup and authorized the integration will need to complete these steps.

I too found the same issue on Slack for colleagues that have Bitmoji connected to Slack. I am not able to include them in group Bitmojis.

I was able to resolve the problem by changing the display name so that it does not contain and spaces or special characters. That seemed to work for a few people. However most recently this little trick has failed.