@Brian Hoyt , Unfortunately, just providing a grant is not possible, along with grant you would have to select one of the options available otherwise the CA policy would not work as expected.
Secondly, there is no way for setting conditions for IPV6 as of now in CA policy. You would have to go by location as a filter using named location.
Hope this helps.
Do let us know if this helps and if there are any more queries around this, please do let us know so that we can help you further. Also, please do not forget to accept the response as Answer; if the above response helped in answering your query.