To see the location of an AirTag second generation, you need to have an Apple device running the latest OS. For some reason, Find My online (website) does not show AirTags. Furthermore, older Apple devices won’t even help you. Sequoia on Mac is unable to see the AirTag second generation location – despite it still being a supported OS version. You need a device running Tahoe. AirTags second generation are surprisingly and unhelpfully incompatible.