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There are several possible reasons why the fallbackMethod of CircuitBreaker is not getting triggered:

1. The failure threshold has not been reached - The fallbackMethod is only triggered when the CircuitBreaker reaches its failure threshold. If the number of failures is still below the threshold, the fallbackMethod will not be triggered.

2. The CircuitBreaker is not properly configured - Make sure that the CircuitBreaker is properly configured with the correct failure threshold, delay, and timeout settings. If any of these settings are incorrect or too high, the CircuitBreaker may not trip and trigger the fallbackMethod.

3. The method being called is not wrapped with the CircuitBreaker - The fallbackMethod is only triggered for methods that are wrapped with the CircuitBreaker. Make sure that the method you are calling is correctly wrapped with the CircuitBreaker and that the appropriate annotations are used.

4. The fallbackMethod itself is failing - If the fallbackMethod is failing, it may not be triggered by the CircuitBreaker. Check the code for the fallbackMethod and make sure that it is handling errors correctly and returning appropriate responses.

5. There is an issue with the CircuitBreaker library - If none of the above solutions work, there may be an issue with the CircuitBreaker library itself. Try updating to the latest version of the library or contact the library developers for assistance.