Active Administrator is not officially supported in AWS. However, it may still work depending on the way is hosted. For example:
If the AA server and SQL Server database are installed on VM servers hosted in AWS, the agents are deployed to DCs that are also on VM servers hosted in AWS or on premises, and all the required ports are open, then there should not be issues. However, if the AA database is hosted with an AWS service (such as Amazon RDS), that will not work.
All of the Active Administrator components have to be installed on an actual machine (Physical or VM).