Hmm have you used Tailscale for other things before? Id assume that would be one of the few uses? Either way you should take the Tailscale IP address of those devices and copy/paste into a browser bar. See if it’ll pull up the umbrel login screen. You’re signing in using Umbrel.local which uses the local network. Instead you’ll login via the Tailscale wire guard vpn it should be numbers like 100.105.201.6 or something like that