Got unexpained "access denied" troubles keeping people from your content? Go to admin/content/node-settings, and try the 'Rebuild Permissions' button.
If that doesn't work, see other ideas for access denied for visitors and access denied for admins.

In my case, getting the correct Amazon account info input was, to the best of my memory, the trick that cleared up the error. In addition, the error message I was receiving appears different from yours. So my guess is your problem has its cause somewhere else...
Regarding the error message you display, is it coming from the admin/settings/amazon form's "Test" tab? Or is this being generated somewhere else?
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Got unexpained "access denied" troubles keeping people from your content? Go to admin/content/node-settings, and try the 'Rebuild Permissions' button.
If that doesn't work, see other ideas for access denied for visitors and access denied for admins.
Hello! I just would like to give a huge thumbs up for the great info you have here on this post...
I may not have a chance to test that for a while, but meanwhile I welcome commentary from anyone...
Hey,
Since I still see some links here, and the guide is quite good, I thought that I may...
Nice article i like the way you thoroughly wrote it.