Diego,
As I understand things, Windows 2012 R2 has support for TLS 1.0 and 1.1 by default. It also supports TLS 1.2, but you would need to manually enable it on your server. I do not believe that Windows 2012 R2 has support for TLS 1.3.
Since TLS 1.0 and 1.1 are deprecated, most servers do not support connections with those versions. If TLS 1.2 is not enabled on your server, it is likely you server will have a difficult time establishing secure connections. Even with TLS 1.2 enabled, you could have issues connecting to servers that only support TLS 1.3.
Andrew Barker
Senior Software Developer
SmarterTools Inc.
www.smartertools.com