SSL handshake failure during SSO

The second one is truncated with the "Length mismatch" error, but can I assume the second one works?

In any case, what you're seeing here is the server side rejecting the client right after the client hello message. The only thing that generally happens in this message is the client sending a preferred TLS protocol, a list of supported ciphers, and any number of TLS extensions (ex. SNI, EC points, etc.).

There is something in the client's client hello message that the server does not like, and is therefore closing the connection. At this stage it can only be a disagreement in one of these things: TLS protocol, ciphers, TLS extensions. I don't actually see the TLS extensions in the capture though.

So to clarify, who is the client and who is the server in this capture?