Issue Summary

This is reproducible on Data Center: no

Steps to Reproduce

1. Create new premium user
2. Go to workspace setting
3. Click "Add to slack button"

Expected Results

User is redirected to https://slack.com/workspace-signin... page

Actual Results

Error message is displayed

User is redirected to 
https://trellis.coffee/integrations/add-to-slack-error?errorId=5a07301a-d588-42cb-9683-b4cdffccbc50
 
Trace file is attached 

Workaround

.