Copilot Connectors >Azure DevOps Work Items >Add Property

Hi

I have setup the Azure DevOps Work Item connector and all is working OOTB.  However when I try to 'Add a new source Property' and add for example 'TargetDate' when I publish the schema change it errors with:

Schema failed to publish with error [‎Removal existing property is not allowed.‎]

I havent removed anything just added.

Anyone else experienced this?

Many thanks