Hi, @Sengo Marimuthu
Thank you for posting in Microsoft Q&A forum.
Agree with Jason, and the task sequence deployment type is a pre-release feature, we have to enable it firstly.
If your "Turn on" button grayed out, you may need to give consent to use pre-release features:
- In the Configuration Manager console, go to the Administration workspace, expand Site Configuration, and select the Sites node.
- In the ribbon, select Hierarchy Settings.
- On the General tab of Hierarchy Settings Properties, enable the option to Consent to use pre-release features.
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