要約

oAuth app returns the following error

 {“code”:401,“message”:“Unauthorized; scope does not match”} 

環境

oAuth apps created via https://developer.atlassian.com/console/myapps/ using Jira Cloud API

原因

You are sending an API request via oAuth apps and it contains the following slash right before the parameter specifically "search/?"

https://api.atlassian.com/ex/jira/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx/rest/api/3/search/?

ソリューション

Remove the slash so that part of the URL changes from "search/?" to "search?" which results in the following end result after the slash is removed
https://api.atlassian.com/ex/jira/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx/rest/api/3/search?

this has to be removed due to a deprecation notice for the Lenient URL which can be found in the link below
https://developer.atlassian.com/changelog/#CHANGE-1320