FederationTroubleshooter
This script is used to gather data to help diagnose and troubleshoot Federation Free / Busy failures.
The script is designed to work with either Exchange Online or Exchange On Premise.
Requirements
Either Exchange Online Powershell or PowerShell On Premise both need to be run as an Administrator. Script is unsigned so will need to have the execution policy modified to allow for it to be run. Set-ExecutionPolicy unrestricted and after the script has been ran you can set it back to default using: Set-ExecutionPolicy restricted.