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Okay while I can reproduce this issue on my site dcache, I confirm it is fixed on prometheus.desy.de so presumably it should work if I upgrade .

Regarding username validation, you may be interested to know that in containers (docker/kubernetes) , often there is no user name.  The UID is already arbitrary and meaningless (just like atlas053 on a traditional grid site) so there is only a UID with no name.

```
bash-4.2$ xrdcp root://prometheus.desy.de:/VOs/atlas/public-file  .
Line 32: xrdcp root://prometheus.desy.de:/VOs/atlas/public-file .
[173B/173B][100%][==================================================][57B/s]  
bash-4.2$ id
Line 33: id
uid=1000 gid=1000 groups=1000
bash-4.2$ whoami
Line 34: whoami
whoami: cannot find name for user ID 1000
```

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