Sync has stopped in Lightroom Classic CC

I have been using my Adobe ID and password for nearly 10 years now. I'm signed in because I'm on the forum, using the Lightroom Classic CC forum on my computer to enter this message. This morning I was synchronized with Lightroom and added about 50 images to a collection online. I went back in this afternoon to add some more and my connection is not there in Lightroom, and when I try to login with my Adobe ID and password I get the message that they don't match. They are the same ID and password that I have used for years. Any ideas?