Your brother's executor has a contact person at the probate court, who can obtain a probate judge's order or declaration authorizing you [or the executor] to do

Your brother's executor has a contact person at the probate court, who can obtain a probate judge's order or declaration authorizing you [or the executor] to do whatever Google says you need authorization for. Do that. The people at the probate court are the ones who know what to do in a case like this.