1. Login to SelluSeller.

2. Click on Configuration> Marketplace Management > Lazada Marketplace.

Note: This error message means the username and/or key that you entered is invalid.

3. Click on disconnect button respective to Lazada Marketplace and connect again.

4. You will be redirected to Lazada Open Platform. Select country and enter your Lazada seller centre account credentials. Click on Sign in And Authorize button.

Hope this answers your question.
You can resolve this error in SelluSeller, by clicking here.

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