cshinn66, we want to make sure that you're able to take advantage of Call Filter without any trouble. Please tell us, is the app fully up to date on your device? Also, is your iPhone 12 Pro Max on the latest iOS version? You can check via Settings>>General>>Software Update. Could you please also tell us if you experience this issue on both Wi-Fi and Cellular Data?
Gotcha. Is your software up to date? Also, you want to make sure the Call Filter app is up to date. Keep us posted.