run_command in /tellraw not working

I put a command in a command block, with tellraw:

tellraw @a {text:"Please enter ",extra:[{text:"PIN",color:gold,clickEvent:{action:run_command,value:"/tellraw @p {text:\"Sorry, out of service\"}"}}]}

I click the button, the message (Please enter PIN) displays, just how it should (correct english? ). But when I clicked on 'PIN', nothing happens! Not even an error.