Hi @Jatish Khanna ,
I did a test in graph explorer to send the request, the response works well there.
I am not familiar with JAVA, but I could get the similar result as yours when testing in C# app.
You could try to change your code like this:
ThumbnailSetCollectionPage thumbnails = graphClient.drives(getResourceDriveId())
.items(getitemId())
.thumbnails()
.buildRequest(requestOptions)
.get();
return thumbnails[0].AdditionalData
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