Joining other client of Service based IT company

Jain_Apoorv
Hii,

I am currently posted from XYZ. Org at Dubai onsite client location let say Client A

I served 3 years at client A and get opportunity in some other company let say Client B at Dubai itself.
Other company is also a client of XYZ but I never worked for it.
Will there be any legal issue if I join Client B?
XYZ Hr is threatening to take legal action if I join Client B.
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