@Dondeti, Mahesh I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
Issue: Unable to map the CIFS share on Windows and add/modify folders and files, but on the Linux side, I can mount the NFS share but cannot access the share directory after mounting, even though the directory has 777 permissions and I am using the root account with r/w and root access configured?
Solution: The issue seems to be related to the 'ntfs' security style option Dondeti, Mahesh selected when creating the dual protocol share. After creating a new dual-protocol share, this time selecting the 'unix' security style, Now able to mount and write to the share from both the CIFS and NFS sides s.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.