I've been dealing with Hikvision camera apps not getting push notifications on GrapheneOS for over a year. I reluctantly ran LineageOS just to keep things working. Then, two days ago, everything Google-services-related went completely haywire on my phone after the TSA had it.
Source: [Dev.to](https://dev.to/alex9001/i-reverse-engineered-hikvisions-apk-to-fix-push-notifications-on-grapheneos-and-submitted-a-pr-to-2ik2)