Forgive me but I'm pretty green when it comes to these F5's. We have an F5 LTM that is load balancing our internal and external email. We just had a pen test done and they saw TLS1 and 1.1 open from ...
Now, i used the cyphers profile which also controled tls1.0, 1.1 1.2 etc. And no tls1.3 basically turned it all of. But i needed that nop dtls1.2 for it to work. So maybe one is covering up the other thinking about it.
The best thing to do, is run that nmap command so you can see what you are playing with and work from there.
yeah i think i made a mistake as the cypher profile overrides some of that config and made it work. no tls1.3 will not enable it, the config is a bit backwards. "enable" NO TLS for example is a positive then a negative. So if you want tls 1.3 then you need to take that out of enable options.
This issue i thnk i had, is that enable options needs something in there to work.
Have you got a test environment you could look at and test before you do this to see what happens.