@LEB-ID Yes, in XO > Settings > Servers should only have a single entry.
XO > Home > Hosts should display your 2 servers
will return also your snapshots. There are several options to the command.
xe vm-list is-a-snapshot=false
This will not most definitely only show Hades.
Are you sure you are pinging the right machine? No change you have a duplicate IP address?
Can you try? Just to make sure it's not a browser problem.
Did you try in XCP-ng Center?
This would help narrow down the problem.
@LEB-ID It's called Add new Server in XCP-ng Center too... old habits die hard. But Pools is not the right word either. It's hard coming up with something short and precise.
How many Pools do you have? How many Hosts?
If you have 1 XCP-ng Pool, you only need 1 entry in your XO Servers page, the master only.
Just disable your current and add the other one with the ip instead of the hostname or vice-versa. Just to be sure your API is responding correctly.
did you try removing & adding the server?
What is the red explanation mark saying?