TLS option missing from SRV DNS record

I’ve done a fair bit of searching. All the guides on MS, here, etc., show configuring an SRV record on CF and being able to select TLS for the protocol.

I only have the options of TCP and UDP available?

I’ve tried TCP and that doesn’t work (I was hoping that with the 443 port it would change to TLS).

Am I missing something or has CF changed their options? In which case, how can I setup my Office365 SRV DNS record that needs TLS?