Migration Tool - "Please specify valid form name" error, even when form name is correct

Migration Tool - "Please specify valid form name" error, even when form name is correct

When using the command line migration tool, we get the message "Please specify valid form name". Nothing has changed from yesterday when this worked. (App name, form name & credentials are correct)

I tried with the GUI migration tool but when I try selecting a form name from the Existing Form drop down, it is empty. (Images attached.)

Has anyone else experienced this?