I have VPN ASA5520-SSL500-K9.
This platform has an ASA 5520 VPN Plus license.
VPN Peers : 750
AnyConnect for Mobile : Disabled
I need to know which type of license shoud I buy to activate AnyConnect for mobile devices (android, iphone, etc)?
Ahh, if it's failover pair, then ensure that you have 2 activation keys, one for each ASA.
Enter the activation key on the ASA, and click enter at the same time to apply the activation key.
If you don't apply it at the same time, it will disable the failover as failover requires exactly the same license on both ASA on version 8.0.4
For mobile, license should be ASA-AC-M-5520=
You don't need AnyConnect Essential or premium anymore since you already have 500 AnyConnect premium license as per your output earlier.