@Vinod Survase,Thanks for posting in Q&A.
From your description, I know you are looking for how to configure NoPinningStoreToTaskbar via OAM-URl in Intune.
Based on my testing, we can create a custom policy with ./Device/Vendor/MSFT/Policy/Config/Start/NoPinningToTaskbar OAM-URl to enable or disable pinning to taskbar. When I set the value to 1, I cannot pin apps to taskbar, and when I set the value to 0, I can pin apps to taskbar again.
https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-start#nopinningtotaskbar
Please try above information, if there is any update, feel free to contact me.
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