UniversalLink and redirectURI are different things. OAuth standard protocol assumes that once the authentication part on the ASWebAuthenticationSession panel is completed successfully, the backend will redirect you to the URI indicated into the redirectURI parameter you used to instruct the request for the ASWebAuthenticationSession. If this doesn't happen for any reason (like a 302 on the redirectURI), then the ASWebAuthenticationSession isn't completed and your call back is never called.
Topic:
Programming Languages
SubTopic:
Swift
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