Welcome @bfm, Here's some information on the condition.
"A polyneuropathy is a diffuse peripheral nerve disorder that is not confined to the distribution of a single nerve or a single limb and typically is relatively symmetrical bilaterally. Electrodiagnostic tests should always be done to classify the nerve structures involved, distribution, and severity of the disorder and thus help identify the cause. Treatment is directed toward correcting the cause."
-- Polyneuropathy: https://www.merckmanuals.com/professional/neurologic-disorders/peripheral-nervous-system-and-motor-unit-disorders/polyneuropathy

@dadcue mentioned having the same or similar condition in another discussion here - https://connect.mayoclinic.org/comment/842749/ and may have some thoughts to add.

There are many discussions and comments from members who have mentioned being diagnosed with polyneuropathy. Here is the link that lists the discussions and comments if you would like to scan through them - https://connect.mayoclinic.org/search/?search=polyneuropathy.

If you don't mind sharing, what symptoms do you have with your polyneuropathy?