Hello Medplum We faced right now the issue that oauth2/token requires codeChallenge https://github.com/medplum/medplum/blob/7f93a0b6efa376fd37aaf290c8d500816c5c6e7c/packages/server/src/oauth/token.ts#L162 however we don't expect it, as we send clientId and clientSecret only we also tested with Epic and Cerner and it works without codeChallenger