As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO CONNECT TO DISPATCH USING SATCOM. GROUNDED - YES. REF AMM 23-15-00-730-801 SATCOM SYSTEM TEST. SUCCESSFUL 2 WAY COMMUNICATION OUTGOING AND INCOMING WITH DISPATCH ON BOTH SAT 1/2 VIA THE MCDU AND CALLING THE A/C'S IRIDIUM SATCOM PHONE NUMBER. OPS TEST NORMAL. THIS CLEARS MEL 23-18.