Additional information :
here are the logs when accessing mobile devices through the user page :
Jun 13 13:01:00 mx3 uwsgi[1341]: [WARNING] (flask.app) GET /api/v1/service/wipe/didier.walraet@cpas-andenne.eu?devices= from ::1 -> 400 '{"message":"Bad Request","errors":["EmptyParameterValue"]}\n'
And those when accessing through the graphical admin web page :
Jun 13 13:03:19 mx3 uwsgi[1341]: [WARNING] (flask.app) Failed to decode sync state: KeyError(deviceid)