Hi @Guillaume_Robin, and welcome to our community.
Seeing this thread, it seems related to the fact that we currently do not support removal of production environment.
Can you provide me the name of the environment you want to remove ?
I can manually set it to a “remote” environment (instead of a production one), so you should then be able to remove it.
Also, could you send me the HTTP request leading to the “Environment deletion failed.” error ? So I can be sure your issue is similar to the thread I mentionned ?
Thanks in advance