Impossible to create new users

Hi, I just want to signal an issue we have had for a while now and I would like to know if you too have noticed it and if so if you think this will be fixed soon : we are incapable of creating new users in the admin interface.

the option to send an invitation does not work with our current configuration (can it be linked to the following message: WARNING: The MAIL_PRIMARY_HOST variable is not set. Defaulting to a blank string.?)
the adduser option lands on a 500 error once we click save and continue editing or save

If you visit http://lectaurep.paris.inria.fr/, you will see we are working on the version available at commit "41e2e985b37107a5762a3db615b6e09d597978e6".

Many thanks in advance!

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