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Oauth flow gets stuck after agreeing terms and conditions when authenticating brand accounts

I have an app deployed which worked perfectly up until yesterday. Users used google oauth to link their youtube channels to the app. The problem I am facing now is that when a user tries to link a brand account or if a user has multiple youtube channels under the same email, he gets stuck in the oauth flow after agreeing the terms and conditions. The redirect back to my homepage never happens. In the browser console, the following error appears:
Transport Error: "Error code = 103, Path = /_/OAuthUi/data/batchexecute, Message = There was an error during the transport or processing of this request., Incomplete XSS header at end of request (HTTP Status: 401) (XHR Error Code: 6) (XHR Error Message: ' [401]')"

Any help on this will be appreciated 

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