Can't add ECDHE cipher in version 11.3.0

Here is the list of ciphers in each version. https://support.f5.com/kb/en-us/solutions/public/13000/100/sol13163.html . The document you are referring to does not say ECDHE is supported in 11.0.0 through 1.4.1. EDH is, but that is not ECDHE. EDH is ephemeral Diffie-Hellman using RSA keys vs ECDHE is ephemeral Diffie-Hellman using EC(eliptical curve) keys.