Hi @Wuxy ,
welcome to the Atlassian community!
Probably you are trying to perform a bulk update. Please verify that Fix Version field is on edit screen for all issue types/projects that you are trying to update.
THis should fix your problem.
Fabio
Please verify that Fix Version has not be hidden for epic in the related field configuration
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.