Dear Sadi,I have faced with the same issue. Port channel is not available on 6.4 version. It was added on 6.6 version. Today recommended version is 6.6.x. In my opinion if you will downgrade until 6.6 it must work. Please check this solution.Hope I c...

Dear Geralt,You must use dynamic DNS services if you don't have static IP address. Using ddns instead of public IP address is the best free solution.Thank you

ASA without NAT how you can imagine it? Of course ASA support it.

Unfortunately right now this is now available. You can't directly connect Azure AD to Cisco ASA.