Hi,
I could help myself in the meanwhile...
Hereafter a summary, just in case.
- permissions have to be defined at right context level : inside a organisation, regarding the right team
- promotion requests initialisation rules have to be dupicated at the organisation level also.
(maybe not mandatory, but it helps)
They should be actyivated and have to point to a writable default folder.
- remain relevant regarding groups, context, teams, etc...
Regards,