Is this serious Problem ? No middle name in receipt and finger print .

earthlover123

Registered Users (C)
Two letters I got from USCIS regarding AOS don't have Middle name .
This is correct format of name : Ram B Sharma ( But Finger print letter and receipt letter has only : Ram Sharma )
Is this serious problem ? In All my application I clearly put middle name .
Now they might have done typo . My Question are:

Can I talk to toll free number and add middle name ?
Should I do this before going to Finger printing ?
or Should I just wait till Interview and tell the interviewer about my full name and do correction at that time ?
 
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