Sign In To Website With Apple ID Not Working

For the longest time I've been unable to sign in to websites I signed in to originally with my Apple ID. These include My Anime List and Tumblr. After I complete the sign-up process something flashes on the screen for a fraction of a second and then I get a blank screen with no information in it, and no way to to back to the website in question. The URL shown for the most recent failed attempt to log in to Tumblr is

https://appleid.apple.com/auth/authorize?state=eyJyZWRpcmVjdFRvIjoiLyJ9&scope=name%20email&response_type=code&response_mode=form_post&redirect_uri=https%3A%2F%2Fwww.tumblr.com%2Fauth%2Fapple%2Fcallback&client_id=com.tumblr.siwa.redpop.production

It's extremely frustrating, having websites I need to access unavailable to me, and it makes me not want to trust Apple in the future. Can anyone help me with this?