OAuth2 - Undefined array key "host"

Trying to follow public auth flow and am receiving the following error after code challenge completes.

ErrorException: [E_WARNING] Undefined array key "host" src/vendor/lusitanian/oauth/src/OAuth/Common/Http/Uri/Uri.php:88

Code:

Request:
array(4) {
  ["url"] => string(491) "/oauth2/authorize?client_id=redactedint&response_type=code&redirect_uri=moo%3A%2F%2Fauth%2FsignIn&scope=alert%3Aread+read+user%3Aread&code_challenge_method=S256&code_challenge=redacted-readacted"
  ["referrer"] =>...

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