We love Disney Plus, and we get how much you do too. That being said, we're kind of annoyed that sometimes we stumble over all sorts of errors, including the error code 19.
It looks like you may have gotten a bit confused here, or Disney is glitching.
Well, according to Disney Plus, the error is generated when you're trying to use an email address that is already associated with an existing account. If you already created a Disney Plus account, you'll need to use a different email address this time around.
Fixing this problem seems to be a pretty direct business.
If the method doesn't work, you can always contact the Disney Plus customer support team. They're available 24/7 over chat, social media, and phone.