The server never claimed to your account.
There are no errors . It just didn’t claim.
Because you didn’t claim, you can’t use Quick Connect yet.
'192-168-0-154.brokenXXXXXXX.direct.quickconnect.to' in header Host; treating as non-local
When you claimed the server, did you get the return result with your username?
Lastly, do you have the Syno assigned to a FQDN ?