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When you generate key&secret pair, make sure that you've set full URL to your site starting from http for the redirect URI, for example: http://example.com/
Try to delete old key&secret pair and generate new one
When you generate key&secret pair, make sure that you've set full URL to your site starting from http for the redirect URI, for example: http://example.com/
Try to delete old key&secret pair and generate new one