please help uscis issue

[simpa11]

i received i 797c like a month ago but i just checked my status andit says:

the post office returned the notice we last sent you on this case I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS as undeliverable. This may have serious effects on processing this case. Please call 1-800-375-5283 to update your mailing address for this notice to be re-sent.

why is that i dont understand if i got my i 797c my i couldnt get notice for finger prints? please hel me thanks a lot

[immihelp]

USPS makes mistakes sometimes.

Follow what they said.

[simpa11]

thank you so much one more question

i called uscis and they said they gonna resend the notice does that mean that they are gonna cancel the appointment for fingerprints and reschedule it or?because that was what i was supposed to get in the mail thanks a lot

[simpa11]

can anybody help me please

usps sent notice back to usic and i had to call them to resend it,does anybody know how long does it take to get the notice again,and what happen if i miss the biometrics appointment do they reschedule or ? thanks a lot