I deleted the group jira-users from the project role Users. The other roles for example Administartors still have single users assinged.
Now the complete project is missing in the project overview and no one can access it. o_O
Does anybody have an idea how to reassing the group users?
Your permission scheme probably says "Browse = Role: Users".
As you've removed jira-users (which usually includes everyone who is able to log in), you've removed all visibilty of the project from people. You'll need to think about how to let them back in - adding them individually, putting other groups in the role etc.
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