I'm currently following the guide listed down below in order to deploy some FTDs in Azure which I've been able to (still in early stages). However, looking at the guide and referencing other materials online, I always see the Diagnostic0/0 interface listed in the gui instead of the Management interface. In my Azure FTD deployments, it shows the Management interface instead of the Diagnostic0/0. Is there a reason the Diagnostic0/0 interface isn't showing?

https://community.cisco.com/t5/security-knowledge-base/high-availability-and-scalability-design-and-deployment-of-cisco/ta-p/4109439/page/2/show-comments/true.
Thx in advance for any support given.