I get a system error while trying to change user email. I.E. I have a 'toto' user, with a "toto@sippro.fr'' email address. ALreay have ticket assigned to that user. I want to change to 'toto.vpu.toulouse@tata.fr" new email address and get a systematic system error message (popup). email detail does not change.... Any idear ? How to debug / worksaround without loosing open ticket assignement and history ?
NB: currently in free plan for test but alerady migrate to pay plan, active starting january 2020.
Many thanks for your support