Let me help check what’s seems not working with your archived forms.
So far, we didn't received any issues for unable to view with their archived forms. I suggest using a different browser to see if it works. If it does, we can go back to your default browser and clear your browser's cache and cookies. But, if in case its still not working, please contact our customer care support so we can investigate further.
Let me know how it goes and hope you will be able to get it before calling our support team. Have a good one!