We have several administrative users behind a proxy server that we simply cannot make work with the *.myshopify.com Wildcard SSL cert from Cloudflare. The custom SSL cert from Let's Encrypt works fine.
I have followed the steps to create a custom domain for my store. I would like to force all traffic to the /admin portal to use that custom domain. Is that possible? I've looked long and hard to find it and come up empty.
For example, the store is accessed via https://mydomain.com with a Let's Encrypt SSL cert I can type in https://mydomain.com/admin and it will redirect to https://mystore.myshopify.com/admin using the Cloudflare cert.
Unfortunately, you can't. Admin are can be accessed only through the *.myshopify.com domain.