To my knowledge neither TLS 1.1 nor TLS 1.2 are supported by the Windows CE/Mobile/EmbeddedHH operating systems under the hood (schannel). Programmers would need to use a 3rd party library like OpenSSL.
Zebra have very poor documentation on HTTS, SSL.
Example of LP 2824 Plus internally use HP ZetAdmin Server but zebra people don't know that story, even they don't know Which server ZD printers are using? so HTTPS is far aways from them mindset.