Cannot complete OIDC flow due to error

[psrpinto]

Expected Behavior

User javiercasares is able to complete OIDC flow so that they can access the Matrix server.

Actual Behavior

At https://login.wordpress.org/wp-json/openid-connect/authorize, the browser shows an error:

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

Steps to Reproduce

1. Go to https://make.wordpress.net/meta/chat
2. Click "Continue with WordPress.org"
3. Click "Authorize" when asked to grant access
4. The browser shows the error described above

Environment

No response

Screenshots

Additional Context

No response

[ashfame]

User tobiasbg also reported a white screen on authorize endpoint.