It sounds like there may be an issue with the permissions or configuration settings in Express DCO and Express ECO. Without more information, it's difficult to pinpoint the exact cause of the problem.
However, one possible solution is to check the permissions assigned to the Change Control Board Identity and ensure that both CM and yourself have the appropriate permissions to vote Approve in the Final Review activity.
Here is another possibility that there may be a workflow or process that needs to be adjusted or configured in Express DCO and Express ECO to enable Approve votes in the Final Review activity.
I recommend consulting with your organization's system administrator or reaching out to the support team for Express DCO and Express ECO for further assistance in troubleshooting this issue.
