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@abh3 continuing this debugging.

I think there is a fundamental mis-understanding on the expected new behavior in the SciTokens plugin with pass through authorization.  I have been running test on the rc4, with no token given.

## Scenerio 1:
The configuration line is specified like:
```ofs.authlib libXrdAccSciTokens.so config=/run/stash-origin-auth/scitokens.conf```

In this case, the scitokens library returns a failure because there is no token in the request, which is correct.  It tries to “pass through” the authorization, but there is no chained authorization so it returns  XrdAccPriv_None
https://github.com/xrootd/xrootd/blob/master/src/XrdSciTokens/src/XrdAccSciTokens.cc#L488

It appears that XRootD then returns failure to the client.  The old behavior was to then go to the Authfile, I believe.

## Scenerio 2:
The configuration line is specified like:
```ofs.authlib ++ libXrdAccSciTokens.so config=/run/stash-origin-auth/scitokens.conf```

It tries to “pass through” the authorization, and there is an object passed through the chain, but it immediately segfaults when trying to call “Access” on the chained auth.
https://github.com/xrootd/xrootd/blob/master/src/XrdSciTokens/src/XrdAccSciTokens.cc#L488


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