I came here to ask about this exact thing!!!  We also just upgraded to 
7.6.1 with Shib auth.

In my Chrome console I see several instances of the dreaded "No _links 
section found" error after Shibboleth authentication occurs.  Everything on 
the frontend is displaying perfectly, so I don't think it's the normal 
misconfigurations documented in the DSpace wiki that typically cause the no 
_links error (and usually prevent the entire site from working).  I think 
this is specific to the authentication/shibboleth component.  I believe 
this is failure is the cause of the error messages you posted.  The API 
calls the auth/shib component makes seem to fail or somehow get an 
unexpected response, that response does not have the _links section, the 
errors you posted get generated, and (to the user) login just appears to 
silently fail.  In the Apache logs, my Shib ID *is* recorded for all 
requests, and as you said, if I look at the Shib status, Shib also says I'm 
logged in.

- Darryl


On Wednesday, November 22, 2023 at 10:00:07 AM UTC-6 Gigawwad Web-Solutions 
wrote:

>  We updated from DSpace 7.6 to 7.6.1 and now a strange error has occured. 
> The JavaScript Console says after successful authentication that there 
> might be an undefined object (see screenshot).
>             
> Do you know anything about this error? 
>             
> Information
>       - /server/api is reachable
>       - Shibboleth.sso shows active session
>       - Session Cookies are set
>             
> Server
>       - Apache2 + mod_shib / mod_proxy
>       - Log shows following message:
>             
>  2023-11-22  unknown unknown org.dspace.authenticate.ShibAuthentication @ 
> [email protected] has been authenticated via shibboleth.
>
> Thank you and best regards
>

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