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To fix the issue of being unable to apply a custom adapter on Android Moshi, you can try the following steps:

1. Check if you have correctly implemented the custom adapter class by verifying if it is implementing the JsonAdapter<T> interface.

2. Make sure that you have annotated the field or the class with the @JsonAdapter(MyCustomAdapter.class) annotation.

3. Double-check that you have registered the custom adapter with Moshi by adding it to the Moshi.Builder() object using the add() method.

4. Ensure that the custom adapter is compatible with the data type being parsed. If not, try implementing a different custom adapter or modifying the existing one to support the data type.

5. Check if there are any conflicts between the custom adapter and other adapters that may be applied to the same data type. In this case, you may need to update the custom adapter to handle such conflicts.

If the above steps do not work, you can try debugging your code or seeking help from the Moshi community.