Hello, I had the exact same problem with my daughter who is 6 months old, I attempted over 10 times and gave the SSA a call. They confirmed that every thing is matching. My daughter has five names (Colombian and Black American) so I anticipated an error on their end but no, everything matched perfectly. Subsequently I tried my daughters First and Last name only (she has two words in her first name, one in the middle, two more in the last). I simply typed ******* Truitt and it actually went through and my taxes were accepted. Maybe you could try to simplify the name and just put your sons first and last name. Best of fortune to you.
