This is a state which can occur in workspaces that have the multi-workspace functionality enabled.
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User is greyed out - it means the user is deactivated in the entire organization. To reactivate them, click on the three-dots menu > Activate.
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User is not greyed out, but there is (inactive) next to their name - it means the user is active in the organization, but inactive in the workspace you’re currently viewing. You can deactivate them (in the Org) by clicking on the three-dots menu > Deactivate.