Hi Richard,
Thank you for your feedback on this and for sharing your experience with us. In this case, it is not likely that this will change, as the limitation that a redirect URI must always match is part of the OAuth 2.0 specification that we are implementing for authentication. Because this is a core part of the OAuth implementation, it is not likely that it will be changed. One aspect of that limitation is that this leaves using a central agent that can pass that redirect on to the correct user as the only option to implement this properly.
Best Regards,
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