you need to reset your Mendix studio pro
have you checked the Mendix platform status
mendix are in under maintenance maybe this reason u not able to deploy Mendix Cloud publishing.
hope that helps you
This was the first time I gave an answer on the forum. But I see, i typed it in the wrong place. I typed it in Comment instead of in Answer.
Ik had the same problem today. I restarted Studio Pro and the problem was solved.
Just typed it again, now in the right place. A learning moment for myself ;-)