Sorry for my late reply. I had to manually re-federate, which means, manually update each hosted feature service in the config store to match them with the old itemids. It is very painful.
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I thought I should update on my post. I've contacted Esri Support, here is their reply: there is a disaster recovery tool for Portal coming out at 10.5 which will address the issues which occur when unfederating and refederating
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Hi, I accidently deleted the federated server from our Portal. I'm wondering if there's an easy way to re-federate ArcGIS Server and make the existing hosted layers still work? We are working with 10.3.1 Thanks!
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