A few things to note about this integration:
1. Your name and email address MUST match in Showcase IDX and Follow Up Boss or the integration WILL NOT work. Make sure they're the same!
2. If there is an extra space in your user name in Showcase IDX (like between your first and last name, or after your last name), the integration WILL NOT work.
The Follow Up Boss integration is a bit finicky that way, but it should work if everything lines up.