Unifi claimed they fixed the adoption failed bug.. they didn't. they made it worse. unifi needs to fix their firmware in legacy devices. just because they're eol doesn't mean they need to
Unifi Switch 24 adoption troubles | Ubiquiti Community
Unifi AP AC Pro "adoption failed" | Ubiquiti Community
US24 POE Adoption Failed & UDMP Disconnected | Ubiquiti Community
Unifi Switch and AP randomly failes to adopt... OFTEN | Ubiquiti Community
Ubiquiti UAP Adoption Failed – Technology Software Center
UniFi Devices show Adoption Failed after migrating controller software | Ubiquiti Community
Fix Unifi Adoption Failed with these Easy to Follow Steps — LazyAdmin