@Danp I'll do some more digging on this once I have some time and see if I can find anything in the logs. I didn't have a chance to look yesterday when I was working on this.
It might be worth noting that I was trying to setup an S3 remote, not sure if it would happen with another one and maybe it has something to do with timing out (was trying to hook into Backblaze which doesn't seem to be working right either, works fine on all my other machines running TrueNAS and stuff but can't get it connected with XCP-ng, other S3 places like Wasabi and Amazon work fine though).
I'll update this thread with more info once I do some more testing, might have time this weekend but not sure yet, and this is in a production environment, so I do want to be careful about causing potential issues.