[MCL-11001] Cannot login using the new beta launcher

Mod Notice

Here's how to disable the beta launcher again:

If you switched to the beta launcher and can't log in, you can switch back by editing launcher_profiles.json in your minecraft folder. Change the "channel" field from "beta" to "release".

– This tweet by [Mojang] slicedlime

Here's a guide on how to find your minecraft folder: Click me

JSON files can be opened and edited by any plain text editor.

If you need any further assistance with opting out of the beta launcher, please join the Community Support help chat. There are people in there that can help you.

Whenever I put my login information into the new launcher it loads infinitely. If I put in the wrong information it says "Invalid username or password" and I have logged into minecraft.net to make sure I was able to login.