What Devices Do I Need to Find an AirTag?
At this point, you’ll only be able to locate your AirTag from an iPhone or iPad running iOS/iPadOS 14.5 or a Mac running macOS 11.3. Older versions of these operating systems don’t recognize or support AirTags.
Note that even with watchOS 7.4 the Apple Watch does not support locating AirTags. In fact, as the name of the watchOS app — Find People — clearly indicates, this wearable version is primarily a replacement for the older Find My Friends app. It can’t find your iPhone, iPad, or other Apple devices either.
You also won’t yet be able to use the iCloud web-based version of Find My to locate AirTags or other Find My network-compatible items. It’s unclear if this is intentional or whether Apple simply hasn’t gotten around to updating the web app yet.
Like Find People on the Apple Watch, however, the iCloud Find My portal is limited to locating devices, making it essentially the flip side of the watchOS version.