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There can be several reasons for not getting the data in the Django REST serializer, some of them are:

1. Incorrect queryset: If the queryset used in the serializer is incorrect, the serializer will not fetch the data. Ensure that the queryset is correct and it returns the data you expect.

2. Serializer fields: The serializer fields may not be set up correctly. Ensure that the serializer fields are set up properly and correspond to the model fields.

3. Incorrect serializer used: The serializer used may not be the correct one for the model. Ensure that the correct serializer is being used for the model.

4. Empty result set: If the data being fetched is an empty result set, the serializer will not return anything. Ensure that the database has data to fetch.

5. Permissions: The serializer may not have the necessary permissions to access the data. Ensure that the permissions are granted before accessing the data.

6. Data formatting: The data may not be formatted correctly for the serializer to fetch. Ensure that the data is formatted correctly before accessing the serializer.