I do not need a solution (just sharing information)
By Default SEP Will Block The Ports Necessary for Airplay to Function
To Enable Airplay :
From the Status Page > Select Network Threat Protection > Options > Configure Firewall Rules > Click 'Add'
Name the First Rule "Airplay TCP"
Under the Port & Protocol Tab, Select Protocol TCP & Enter 3689 For Both Local & Remote
Click OK
Click 'Add'
Name the Second Rule "Airplay UDP"
Under the Port & Protocol Tab, Select Protocol UDP & Enter 5353 For Both Local & Remote
Click OK
Highlight each rule one at a time by Clicking On it once to turn it blue & Move both rules to the top of the list by using the Up Arrow Button
Hope this helps anyone baffled by the lack of an Airplay Button Within iTunes Running On a Windows PC W/ SEP
DMB