Without seeing any details, may I ask what your network topology looks like, and what firewall/routing rules there are both on your server and your router?
From what I can gather, you are using Windows 10 as your server OS, and a current FireOS device as your client. Have you tried other devices, and do they also exhibit this behavior? Does this only occur with a single physical client/device, but others do not have this issue?
I am trying to be helpful, but in the dozen or so posts you've made, all I know is that often your guide doesn't show, you have a Win10 machine as a server, and a current Amazon device as a client. Can you provide some more granular details that might help narrow this down?