Anna,
I just did it and i checked on my vendors account and the pro dashboard is still not working.
I added the pro dashboard on the “my profile Menu” and saved it. I went to my vendors account on another browser and clicked on the pro dashboard and it still wont bring me to the dashboard pro. But instead it brings me to the “My Account” Page.
On the my account page there’s a highlighted “vendor dashboard” and even if i click that it dont go anywhere it just stays on ” my account page”