Can not revoke contacts?
Hello! I don't quite understand your question... Could you provide a little more information about what you are trying to do?
If you mean that you have shared sheets/workspacesto sombody and you no longer wish them to see them then remove them from sharing those items.
To remove them from you contacts list go to Account ~ My Smartsheet Contacts
Select contacts and using the dropdown option select delete.
I believe if you are using an Enterprise account you have other options
