Sometimes the User Profile Synchronization service may not start properly, stucks in starting mode or simply remains in a "stale" state. Also it may happen, when you have used a powershell Script but with some missing or incorrect settings, which then will cause the sync service to fail as well.
So usually, MS Support suggests in such cases most likely to recreate the entire User Profile Service Application (which BTW is really most recommended when things going wrong that way).
But maybe this...(read more)
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