Confirmed today that CloudFlare Tunnels supports multiple accounts on the same machine (in my case,
Published September 05, 2022
Confirmed today that CloudFlare Tunnels supports multiple accounts on the same machine (in my case, a raspberry pi), but you need to setup each tunnel with separate auth/config/etc. i.e. Do the full cloudflared login loop for each account.
Multiple domains within a single account work fine with a single credentials setup.