You should have obtained latest Immigration news before leaving QATAR.
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Anyhow, confirm news is that u have to wait for 2 years before coming to Qatar.
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RUMOURS:
1- You have to seek NOC of your old employer inorder to enter in Qatar for/with a new WORKING VISA
2- Govt is planning to extend the duration of ENTRY BAN from 2years to 5 years.
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Good luck to u