I have a case:
I create a custom post type with name is “location” and create taxonomy with name is
district. I use acf create a field radio button in taxonomy district. Then i get_field it, but it return null in spite of value
When you are editing the “location” post can you see both your ACF taxonomy field and the default WP taxonomy meta box? Are you using “Save” and “Load” terms?
Please provide more detail.