@Subramani, Sree Susmitha
After some research into the error itself The property 'requireGuestProvisionSignal' is not valid because the 'Microsoft.Compute/Agentless' feature is not enabled for this subscription. I was able to find the following document that references this property.
Unfortunately the documentation here is not very useful to distinguish between what a subscription would require to have in place in order to use some parameters.
I also looked under the Azure resource explorer where you can find the details of the different resource providers and I was able to confirm that there is no Microsoft.Compute/Agentless provider listed even for my own subscription.
I would recommend to remove the property altogether from the template (based on the fact this property is optional) and try again.
Hope this helps.
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