OAuth consent completes but no third-party app access registered - invalid_grant after eBay app reinstall | APIs Feedback, Comments and Suggestions

dlacare · 2026-06-18T20:39:46.488109Z

I had to reinstall the eBay app on my seller account (dlacare) due to an authentication problem. Since then, my Apps Script integration using the Sell Fulfillment API has stopped working.The OAuth consent flow appears to complete successfully — I get "Authorization successfully completed" — but no app appears in My eBay → Account → Sign-in and security → Third-party app access. Every refresh token I generate is rejected with:{"error":"invalid_grant","error_description":"the provided authorization refresh token is invalid or was issued to another client"}I have verified:Client ID, Client Secret, and refresh token are all correct and match the registered appOAuth scopes include sell.fulfillment.readonlyThe consent URL was run in incognito with the correct seller account logged inThe code (Google Apps Script) is correct — it uses the standard OAuth2 token exchange endpointApp ID: Discount-DLAcareS-PRD-324df0a2d-2e02ffeeEnvironment: ProductionSeller account: dlacareIt appears the eBay app reinstall broke the OAuth trust relationship between my developer app and seller account on eBay's backend. Is there a way to reset this?

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OAuth consent completes but no third-party app access registered - invalid_grant after eBay app reinstall | APIs Feedback, Comments and Suggestions | eBay Community