I created a ACME managed certificate for domain mail.example.com of User A but now I want to use it as mail server certificate. This is impossible because the admin user is not owning and therefore cannot see the certificate of user A. Obviously I want the certificate to work now and being updated automatically when it expires (the old one is expiring soon).
What is the appropriate procedure to migrate this certificate to the admin account where I can then use it as mail server certificate? What happens when I delete the certificate? Can I then request the same domain again under the Admin account? Or will it be revoked / blocked until expiry?
Please note that this is not only moving ACME certificate from one subscription to another but also from one LE ID to another. LC does not allow to re-use a LE ID between different subscriptions, which I experience as a great disadvantage.
As company I manage admin, my clients under a reseller account and my hosting domains under a normal hosting account. In this set up I would need only one Let's Encrypt ID for all my certificates, but LC does not allow me and tells me the ID is already in use.
I would like the Certificate management to be centered around the Let's Encrypt ID, not around the LC subscription. Now I have several different LE IDs in several contracts and they cannot be used between each other. The whole questions I ask here are a result of this.