We are following the step listed in the documentation below to redirect the authentication request to messages-auth://?status=success
https://register.apple.com/resources/messages/msp-rest-api/type-interactive#url-scheme
However on both iOS and macOS (latest versions) messages-auth:// is not a recognised endpoint to open the messages app again. For example messages:// is working to open the messages app.
mmaghraby
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