Hi, I raised this question via support and was referred to the dev forum to confirm how this is handled. My assumption is that Genesys will try both TLS 1.2 and 1.3 for all Data Actions, since we cannot configure which one needs to be used for each Data Action.
The only documentation I can find that mentions TLS versions is the deprecation of 1.1, and how Genesys only supports 1.2 and 1.3 now.
The data action service supports TLS 1.2 and 1.3 connections. It will use the highest version that the configured endpoint supports. So the data action service prefers 1.3, supports 1.2, and will fail the data action execution if the endpoint only supports a lower standard.