I've recently added a new user to Jira. He's already in the jira-software-users group, but I can't add him to a specific project, the button is disabled and the tooltip says that I should add them from the admin page, but there's not an option to do it.
Thank you for reaching out to Community!
As per the screenshot, I can tell that you are using a Classic Jira Software project.
The message you are seeing is expected because anyone added to your site on Site administration will be an admin on Software and Core projects.
If your site has always been on a Free plan, everyone with access to Jira Software is an admin for all Jira Software projects, and the same goes for Jira Core.
That's why you can't add people there, because technically they already have permission, it's not necessary to manually add them.
I can see that you upgraded your plan to Standard yesterday, so now you will be able to manage roles in Classic projects.
If you have any other questions regarding this matter, please let us know.
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