Airpod hearing test not working, "due to background noise"

Like many others I upgraded to Airpod Pro 2nd generation to take advantage of the Hearing Aid feature. Like many others I have attempted the 'hearing test' multiple times, at various locations (all quite actually), only to be messaged: Unable to classify due to background noise". What is going on. Apple is falling short here; they promised a feature that clearly cannot be delivered to customers. Any suggestions?