After logging into WorkflowMax, look at the address bar of your browser.

You will see a URL like:

https://app.workflowmax.com/organizations/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/dashboard

The highlighted part below is your Org ID:

XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX

Copy and paste that value here.