Solved Change Dashboard Domain
I just installed cloudron, and I wanted to see how to change the dashboard domain from my.mydomain.net to my.admin.mydomain.net.
I'm using Cloudflare, and the generic option as "provider".
The dashboard domain change is documented at https://cloudron.io/documentation/domains/#changing-the-dashboard-domain
In your case you have to add
admin.mydomain.netfirst in the domains section in your Cloudron dashboard.
This has worked. Thanks!