Mediare witholding on 2025 tax retrun

I did our company's W-2 forms via efiling.  However I now see that I put in the wrong amount for one of the employees Medicare tax amount.  I tried to efile a correction but if won't let me.  They told me to call SSA which I did.  The person at the SSA office said it was OK and not to do anything.  

 

Is this correct information and Why can't I correct the Medicare tax amount via efile?