This is likely due to either API configurations or permissions not being set up properly.

Follow these steps to address the issue:

• Check if the Recommender API is enabled at project level
• Check if the following permissions are enabled in the IAM member associated with projects:

recommender.computeInstanceMachineTypeRecommendations.get
recommender.computeInstanceMachineTypeRecommendations.list
recommender.computeInstanceMachineTypeRecommendations.update
recommender.locations.get
recommender.locations.list