I am using my new macbook to install new nested esxi on top current cluster environment. During installation, it requests me to input F11. I stuck there for long time. I wonder if all keys failed and checking a lot on VMRC version, grading VMRC, using different browsers and even trying out booth vSphere web client and html5 client.
Finally, I solved it by holding "fn"+"command"+"F11 on the Touch Bar". What my lovely MacBookPro!
Thanks to vmexplorer post.