OK, so the first thing we can see there in the comments is that someone found that with that setting turned on, it prevented the phone from being able to roam between access points, so that’s probably the issue with the phone.
As for the next part login to the router, find the part about configuring the internet connection and in there will be something like WAN DNS or something, if it’s set to get it automatically - then it will be using whatever the ISP set when you receive your WAN IP address from them. I typically use 8.8.8.8 (Google) and 1.1.1.1 (Cloudflare) which gives me redundancy if Google or Cloudflare fall over, it’s not likely both will fall over at the same time without some major global internet outage.
Sadly I haven’t yet got Kbin’s RSS to work with FreshRSS. It claims there is no feed. Which is a shame. But yes I use FreshRSS daily 👍