Is the "Find my device" app & network somehow dependent on "Find Device" in my bluetooth settings? If not, why else might it not have worked?

Earlier today, the Find My Device app said that it could not show the location of my earphones ([Sony WI-C100](https://www.sony.co.uk/electronics/in-ear-headphones/wi-c100/specifications)) , because it had not seen them in the last 7 days. But I *have* been connected to my headphones several times in the last 7 days. This might or might not include the walk where I dropped them and had to come back to find them later, with absolutely no thanks to my phone :-). So I'm a bit puzzled. 1. When I have enabled Settings > Security > Find My Device > "Find your offline devices", is my phone supposed to automatically save the last location it was connected to my Fast Pair accessories, for use in the Find My Device app? 2. Does this still work when the separate setting "Location History" / "Timeline" is disabled? 3. In what situations does this feature stop working? I understand it will not work if location is not working or disabled on my phone :-) ("Use Location" setting). It's supposed to be possible to understand this collection and processing of location data, because Google "work hard to [protect your information and put you in control](https://policies.google.com/privacy?hl=en) ". Settings > Bluetooth > WI-C100 > Find device says it will not show "Last known location" on that page, because I have chosen not to enable Google's "Location History" service. Technically, searching settings does not find "Location History", so I assume this actually means the setting Location > Location services > Timeline. By contrast, I can see WI-C100 in the Find My Device app. (It took just over ten minutes to appear after I first connected the earphones & agreed to Fast Pairing). Tapping WI-C100 shows a map with the last connected time and location. I have checked that this is not just showing my current phone location. The following is enabled on my phone: Settings > Security > Find My Device > Find your offline devices, "with network in high-traffic areas only". The description says "To help locate this device and your Fast Pair accessories when offline...", and "Locate using stored recent locations OR the [network](https://support.google.com/android/answer/14796936?visit_id=638759070241024882-2601693823&p=fmd_network&rd=1#finding_offline_devices) in areas like airports or busy footpaths." I usually enable "extreme battery saver" on my Pixel phone. "Find My Device" is not in my list of "essential apps", therefore this app is usually paused. Similarly, this app does not have "Unrestricted" battery usage enabled on my phone. This means that if either Extreme or Standard Battery Saver is enabled, the app would never run in the background. Is Battery Saver expected to pause this feature? Or is the location data saved by an app like Google Play Services, which is always allowed to run in the background? I have also disabled the app which is named "Google" on my phone, because I don't want Google search / news / weather / assistant in an app format, or as a non-removable search box on my home screen. * Accessory: [Sony WI-C100](https://www.sony.co.uk/electronics/in-ear-headphones/wi-c100/specifications) earphones (Fast Pair support) * Phone: Pixel 8a / Android 15 / 5 February 2025 * Google Play: 1 January 2025 I did upgrade the Sony firmware to 1.0.7 (29-08-2024) after the "not seen in 7 days" result, and before the more successful results above.