Can't restore from backup.

I have restored , then upgraded to IOS 14.2 on my backup iPhone 6S. For some reason I'm getting the error "this icloud backup includes purchases from the app store that were made with a different apple id" when I try and pull my icloud backup down.(, see attached file.) Somethings changed since Ive done restores in 2020, 2019, 2018, etc. I have not downloaded any content and logged into this apple ID in the last 4 years, or actually ever. This email address is my sisters non family-sharing apple ID, so she could have purchased an app logging into her apple ID on my fathers family-sharing phone, and as we are all family sharing, maybe this has infected my download? Anyway, its impossible to search for apps in my history in iTunes/IOS/etc that used my sisters apple ID. The forum here just has a standard reply, check your download history. But this is impossible to search for a purchase by apple ID. As I said, Ive never had this issue before, and can't get my sisters password as she's in the USA. I just want to delete this purchase from my apple ID, but its impossible to find it on my phone. Or impossible to find it on any other devices in the family.

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