SSH into Devices running old versions of Dropbear SSH (e.g. UniFi APs, and other routers)

This is actually a really useful find. A lot of people would probably assume the problem is with 1Password or their SSH config, when it’s really the old Dropbear implementation on the device side. Older Dropbear versions on things like UniFi APs, routers, and OpenWRT devices can be surprisingly limiting with modern SSH tooling. The key detail here is that those older builds only support ssh-rsa, while newer agents/tools try to use newer RSA SHA2 algorithms or Ed25519 keys by default. The agent refused operation error is especially misleading because it sounds like the agent itself is broken. https://speedport-ips.de/passwort-wlan-name-andern/ firmware is probably the best fix if possible. Otherwise people end up wasting hours tweaking SSH configs when the real issue is just the device running a very old Dropbear release.