As PDM said, you need to make choices in a browser window before producing directly to YT. Here's what they should look like:
If you have multiple google accounts, you'll need to choose one
Then/otherwise you need to grant the following permissions
At that point the webpage changes to this message
and PD should regain the focus with this confirmation screen
If you're not getting any browser action when you click on
Sign In, maybe try uninstalling PD (right click on it in the CL App manager and choose Uninstall) and then reboot. Now install it again and see if that helps. If you still don't get a browser response, I think you should report the issue to CL tech support from the link in PDM's signature and see if they can assist you.
FWIW, I always produce my videos to my hard drive then use the Create | Upload Video tool on YT to publish it. The options for directly sharing the video from PD are limited - including not being able to make the video unlisted - whereas I have full control from the YT Studio page.
One last thing is there seems to be a display problem with overlapping options on my system that doesn't go away if I resize the window