Issue in ./help/stores-purchase/ups.md
Instructions are pretty poor on what to do with the UPS api change and how you get new credentials and what to do with those credentials.
Basically you have to create and app on ups developer site by following these instructions
https://developer.ups.com/get-started?loc=en_US
There is no mention that you use the client id and client secret from the new ups app you created as your new ups username and ups password in the ups shipping settings.
I had to contact Adobe Support and UPS API Support to figure this all out.
This could be explained so much better on what people should do both here and on this page ./help/troubleshooting/known-issues-patches-attached/ups-shipping-method-integration-migration-from-soap-to-restful-api.md