Hi Bott84
welcome to this Appl (usr-to-usr) Community!
Re: "Hearing Test on AirPods Pro 2: ...cannot complete the first test on the left ear because background noise too loud even though quietness test completed earlier in test stated an ok level." "Does anyone have a solution?"
We can't really guess which solution will solve the issue, without pinpointing the cause of your difficulty
Eg: Using "Noise cancellation" may, or may not help:
See: Active Noise Cancellation and Transparency modes for AirPods - Apple Support
Generally, there's no way to prevent a (maybe un-noticed) airplane from flying overhead, or such, during the test
Seems some folks have resorted to doing the hearing test in a wardrobe to avoid background noise intruding.
Major city libraries, and some universities, sometimes have a soundproof room available.
(I understand that we can also use an audiogram from a hearing-professional to set up the hearing-aid feature)
Another cause can be that the ear-tip becomes slightly dislodged during the test, (instead of being "sealed"):
If you haven't seen it already:
See how to: Choose your AirPods Pro ear tips and use the Ear Tip Fit Test - Apple Support
If needed: Video: How to remove and replace the ear tips on your AirPods Pro – Apple Support
https://www.youtube.com/watch?v=pf8TbVaggu8
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Apple support provides tips in the article below:
Take a Hearing Test with AirPods Pro 2 - Apple Support
Eg: says:
"Clean your AirPods Pro. Debris can affect the ability of your AirPods to provide a complete seal in your ears.
You should also clean your AirPods periodically so test results are as accurate as possible".
and:
(Point 5) "If you remove or adjust your AirPods (or if the environmental noise around you becomes loud), the Hearing Test may pause. The test resumes when you put the AirPods back in your ear or when the environmental noise is quiet again".
Online Resource: AirPods User Guide - Apple Support
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More support . info. if needed:
"Find all the topics, resources, and contact options you need for your AirPods"...
AirPods Support Website: AirPods Support - Official Apple Support