Looking for logging into the Oauth Page Get Not Allowed site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Oauth Page Get Not Allowed site. After that you can login as usual with your login credentials.
https://oauth.net/articles/authentication/
https://stackoverflow.com/questions/21393172/facebook-auth-flow-is-not-allowed
https://github.com/postmanlabs/postman-app-support/issues/3977
https://developers.google.com/identity/protocols/OAuth2UserAgent
https://auth0.com/docs/protocols/oauth2
https://auth0.com/docs/api-auth/why-use-access-tokens-to-secure-apis
https://developers.facebook.com/docs/facebook-login/security/
https://www.oauth.com/oauth2-servers/authorization/the-authorization-response/
https://docs.microsoft.com/en-us/linkedin/shared/authentication/authentication
https://www.themarketingtechnologist.co/google-oauth-2-enable-your-application-to-access-data-from-a-google-user/
https://www.django-rest-framework.org/api-guide/authentication/
https://docs.moodle.org/en/OAuth_2_authentication
https://developer.wordpress.com/docs/oauth2/