Allow Microsoft Edge to block navigations to external protocols in a sandboxed iframe

Microsoft Edge blocks navigations to external protocols inside a sandboxed iframe. If you enable or don't configure this policy, Microsoft Edge blocks those navigations. If you disable this policy, Microsoft Edge doesn't block those navigations. This policy can be used by administrators who need more time to update their internal website affected by this new restriction. This Enterprise policy is temporary; it's intended to be removed after Microsoft Edge version 117.