AES 7.2 is the latest version of AES. Would it be possible to upgrade?
That said, AES 7.1.7 deployed on Pega 7.1.7 or beyond should be able to monitor nodes of Pega 7.2. You mention that the enterprise health, alerts and exceptions are not coming through. Please check if from the monitored node machine, you are able to use the URL provided in the PDC landing page and access it. Are there any errors seen in the log file of the monitored node?