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Once we had old users revoked of site access we ran into what seems to be JSDCLOUD-60436042 that prevented any portal user account being created creation for any pre-existing or event deleted account, whether it was involved in an issue or not . We were a bit blocked- some workarounds for admins have now been posted.
Confluence
Confluence was relatively simple, we enabled public access, removed group level access for right to use and done. Available anonymously:
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