You’re using SketchUp Free (web)? And you’re trying to access the 3D Warehouse through it? Or are you trying to get tot he 3D Warehouse directly in your browser?
I don’t know if Malwarebytes can cause this symptom, but ad blockers do. You could either turn those off when signing in, or see if they have settings to allow accounts.sketchup.com and id.trimble.com.