This can be easy to overlook, especially in the stressful situation of a separation. Immigrants, including green card holders, are required to notify USCIS of a change of address within 10 days of moving to that new address. If you overlooked this and are late, still file it. Here is a link to the USCIS website section on how to comply using form AR-11:

https://www.uscis.gov/ar-11?fbclid=IwAR0llGiKm9BILcZPypElId2KJ1KtlrXqBSowQIfFEev8Yx6Vb8wDp0V6jUg