CHANGE BATT error after new battery and alternator

The alternator failed on our 2011 Odyssey. I replaced it with a rebuild from NAPA and a new battery. Now the battery light comes on, and the dash says CHANGE BATT. Is there any way for me to isolate the problem? My local NAPA says they have no way to test the alternator.

Sounds like BS. Go to another parts store. Don't tell them you just bought it from Napa and have them test the charging system. Or if you own a Voltmeter. Remans have been know to be bad out of the box.
https://www.aa1car.com/library/charging_checks.htm