@noahrama Is this an oidc app ? Could you paste the request that is erroring out (from browser developer tools, network tab) ?
If the /authorize request is erroring out with this error, then the redirect_uri that is passed in the /authorize (configured as part of widget or sdk) should be configured in the ‘LoginRedirectUri’ in application settings and also in the trusted origin (Security->API->Trusted Origins) with ‘Redirect’ option checked.