My son has two middle names and it will only let me put on character for his name. What do I do? The middle name is Henry Lee so the box should be HL

[ayc_sports_babe0]

the box will only let me put the H or the L. I didn't know if it mattered if the L was missing

[KarenL2]

It won't matter.  The IRS matches the social security number with the first few letters of the last name.  The middle initial you choose shouldn't matter.  That said, most people put the initial of the first middle name.