I am using Adobe Premiere Elements 9. I have a valid Adobe ID because I can use it to log into adobe.com successfully. However, when I try to use it to sign in from PE9 ("Sign In With Your Adobe ID" at bottom left of opening screen), it gives me: "Error: Photoshop.com services are currently unavailable. Please try again later or check your network connections. Error 400."
Do not "Sign In" to Premiere Elements 10 and earlier. "Sign In" is gone along with the photoshop.com and photoshop.com plus feature.
Also, be aware that you probably still see content associated with photoshop.com plus members only. Even though you see that content as
thumbnails, the content is no longer available to you. It went with photoshop.com and photoshop.com plus.
Please try again later or check your network connections. Error 400."
Just do not go through the "Sign In" ritual and instead (after any indicated Cancel) proceed to import, editing, and export.
Any questions, please do not hesitate to ask.