When try to login to my app with Instagram account in mobile Safari I get 403 error: Implicit authentication is disabled.
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By security reasons Instagram disables OAuth 2.0 implicit authentication flow (client-side authentication) by default. If your app hasn't server side you should go to Manage Clients Security section and unset Disable implicit OAuth option. After saving all should work well.

Anton Gaenko
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2In my case it was already unchecked, but I had to explicitly check -> uncheck -> save (I guess it's a bug on their system) – Islam May 26 '19 at 02:56
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as the site has changed now how can i disable implicit auth? – komal jituri Dec 04 '19 at 09:41
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i cant see these options, how can i enable this. – Anurag Chandra Jan 16 '22 at 15:54