Sorry to drag this one up again, but this newbie is having the same issue.
Flight plan filed and pending (EGJJ-LOWI). Logon to CPDLC using LFRR (suggested in flight briefing page), connects and sends. No message comes back with squawk code. The "Clearance Request" button remains de activated and un clickable, as do all buttons on the ATC menu except logon.
Anyone have any suggestions please?
Thanks
Pete