Unable to see the Contract & custom Salesforce object records using Microsoft Copilot for Sales

Hi,

We figured outing adding customer objects from Forms section in Copilot for Sales Via outlook, not getting the option to 'add fields' under 'Manage Fields' section of the custom object like we get in Account and Opportunity objects.

Could you please help us on this?

PS: To be more specific, getting the 'add fields' under 'Manage Fields' section for other objects like Opportunity and Account but not for custom objects.

Thanks
Santosh