You can try to add the following code:
a.
patchDocument.Add(
new JsonPatchOperation()
{
Operation = Operation.Add,
Path = "/fields/System.AssignedTo",
Value = "***@***.com"//Accound Name
}
);
b.
patchDocument.Add(
new JsonPatchOperation()
{
Operation = Operation.Add,
Path = "/fields/System.Tags",
Value = "tag"//Tag Name
}
);
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