I just looked at my Pihole and I don't see any requests for this domain in the last 24 hrs. 4 people with android phones on my network. Maybe best to block it for now? Could be from an app you have running in the background too, if you transfered data to the new phone.
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Hmmm, that's weird. I'm definitely blocking it, but I thought NetGuard would see from which app it originates. Since I would really like to remove that app. I reinstalled most stuff from my old phone, so it could have come over with an app I already had.
Edit: I remember when I noticed that my ASUS routers are pinging google for connectivity checks. Fortunately, those were configurable. (RT-AX58U and RT-AX58U v2.)
Could be an IoT device pinging memfault with a keepalive or connectivity check. These are usually hard coded, but, as you said it yourself, absolutely blockable.

Thanks, it's coming from my phone since pi-Hole matches it to my phone and NetGuard (firewall app) sees it originating from my phone as well.