WiFi exclamation mark in status bar

The Wi-Fi bars constantly have an exclamation point now. A pop up box comes out constantly now. " the network you are trying to sign in to requires you to sign in through your browser first. But it takes me to Google and I'm already signed in and then sometimes it takes me to other places with error messages. I have screenshots. I have Xfinity WiFi and Android phone lgg2. I have found nothing on this online anywhere and I've been looking for a month. Help

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