@Tristis-Oris Thank you so much! I had been pounding my head on this one; all other research I had uncovered didn't get me to this solution.

Note: I did have to add --allowUnauthorized as my XOA interface is only available on HTTPS and I'm using a self-signed. (xo-cli --register --allowUnauthorized https://url login)

How can I clear these XO failed tasks? I have a small xcp-ng cluster, 2 hosts and an xoa from source build on Ubuntu Server. I haven't been able to find a way to clear these tasks.