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Wed Sep 11 2019 11:18:00 GMT-0700 (Mountain Standard Time)
Currently, users are not able to view OAuth scopes for sandbox keyset, or generate sandbox OAuth token via developer.ebay.com
We are actively working on this issue.
If you are an existing sandbox API user and know the scopes your application authorized to, you may generate an OAuth token by following the steps in this KB article: https://ebaydts.com/eBayKBDetails?KBid=5075