Dear @Karthik.Prakash.
I agree with @Duncan.vanderHeul. In addition to NacYaw, you should also set YawNeut, at least when the YawDOF is enabled. This is discussed more in my post dated Apr 19, 2022 in the following forum topic: Tower strike with latest versions of OpenFAST and IEA 15MW - #14 by Jiaping.Cui.
Best regards,