I am having issues trying to change the Bit Key in DKIM from 2048 to 1024 so that it works with my Shopify Account. I can only find information on how to configure this when the Domain Key is added, but I couldn't find any details on how to change it afterward. I submitted a request to support, and they keep sending me information on how to add new Domains. Worst case scenario, do I delete the Domain and then re-add it? Thanks.