Hello,
I was able to make a bit of progress from my previous question. I resolved the problem by making the following changes to my application.properties:
`pring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
spring.security.oauth2.client.registration.twitch.client-id=redacted
spring.security.oauth2.client.registration.twitch.client-secret=redacted
spring.security.oauth2.client.registration.twitch.client-authentication-method=post
spring.security.oauth2.client.registration.twitch.redirect-uri=http://localhost:8080/login/oauth2/code/twitch
spring.security.oauth2.client.registration.twitch.provider=twitch
spring.security.oauth2.client.registration.twitch.scope=user:read:email
spring.security.oauth2.client.registration.twitch.authorization-grant-type=AUTHORIZATION_CODE
spring.security.oauth2.client.provider.twitch.authorization-uri=https://id.twitch.tv/oauth2/authorize
spring.security.oauth2.client.provider.twitch.token-uri=https://id.twitch.tv/oauth2/token
spring.security.oauth2.client.provider.twitch.user-info-uri=https://id.twitch.tv/oauth2/userinfo
spring.security.oauth2.client.provider.twitch.user-name-attribute=Redacted
`