You might want reset your Hybrid configuration or start it from scratch because you’re having issues with it or it’s not functioning properly. in Exchange 2010 the removal of Hybrid integration from powershell will almost everytime end up with errors or not work due to an issue.
In order to get around this and get on with the removal of the Hybrid environment .. please follow this guide
Open your Exchange Console and start by removing the Organization Relationships.
Once that’s complete go to Hub transport and remove all the remote domains that have been added from the Hybrid Setup.
Remove Microsoft O365 tenant domain which ends with on.microsoft.com
Make sure that you delete the Connectors that have been created by the Hybrid Wizard e.g. Outbound to Office 365.
Removing Receive connectors (Inbound from Office 365)
Since remove-hybridconfiguration cmdlet is not supported to remove the hybrid configuration object from AD then we have no choice but to use ADSIEDIT tool to do so.
I will navigate to Configuration > Services > Microsoft Exchange > First Organization > Delete “CN=Hybrid Configuration”
Restart MSExchangeServicehost after you have deleted the Hybrid object.
Now you can restart the Hybrid setup again from scratch