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Thank you, that was what I needed for sss. I now successfully relay the ztn credentials to the origin.

My last sticking point is that I can't figure out how to map the token subject to a unix username.  Is this a SciTokens plugin issue rather than a credential forwarding issue?

On the proxy server's scitokens config I get a `name_mapfile` match as I pasted in my original note,  but on the origin I see the token subject, not the mapped username.


```
221207 10:09:51 8449 multiuser_UserSentry: Switching FS uid for user xrootd
221207 10:09:51 8449 multiuser_UserSentry: Switching FS uid for user xrootd
221207 10:09:51 11912 XrootdXeq: U2.3393788:25@dtnxxxx pub IP46 login as http://cilogon.org/serverA/users/xxxxxxx via ztn auth for bhess.230397:34@origin
221207 10:09:51 11912 multiuser_UserSentry: XRootD mapped request to username that does not exist: http://cilogon.org/serverA/users/xxxxxxx
221207 10:09:51 11912 multiuser_UserSentry: XRootD mapped request to username that does not exist: http://cilogon.org/serverA/users/xxxxxxx
221207 10:09:51 11912 ofs_open: U2.3393788:25@dtnxxxx Unable to create /gluex/bbb; permission denied
221207 10:09:51 11912 U2.3393788:25@dtn2201 Xrootd_Response: sending err 3010: Unable to create /gluex/bbb; permission denied
221207 10:09:51 11912 XrootdXeq: U2.3393788:25@dtnxxxx disc 0:00:00
221207 10:09:51 11912 multiuser_UserSentry: XRootD mapped request to username that does not exist: http://cilogon.org/serverA/users/xxxxxxx
```




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