Intermittent flagpole sound from under car at low speed?

This is common when one of the plastic weather shields has come loose and needs to be reattached. Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response. Raise your car up so you can look under it and check the shields, this guide can help:

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Please run down this guide and report back.