Just installed a SLED12 and after waiting a big while for my code to showup in SCC, I've tried to activate with SUSEConnect -r XXXXXXXXXXXXXX -e olivier@XXXXXX.com

The result is "stange" as I get his message:
Error: SCC returned 'Validation failed: System has already been taken' (500)

I've deleted all systems in SCC ... no change.

No /etc/SUSEConnect to delete...
No /etc/zypp/credentials.d or /etc/zypp/credentials.cat to delete ...

Any idea that could help would be really welcome.
Thanks in advance.