Fingerprint postponement at VSC

Hi

I will most probably be unable to make it for my fingerprinting appointment next week at St. Albans, VT.
In order to reschedule it for next week,
1. Do I or my lawyer need to get a formal postponement date ?
The notice states that I can go on any following Wedenesday till June 19th.
2. Will there be an issue if I postpone it by a couple of weeks
apart from a delay in the GC process ?

Has anybody been in a similar siyuation ?
 
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