> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://doc.common-services.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# I cannot connect Shopify to my Amazon seller account. The app shows 403 Unauthorized or Access to requested resource is denied.

This error message can appear on two instances:

* [You have an existing account connected in the app](https://doc.common-services.com/en/article/error-failed-to-obtain-marketplace-account-connected-u2t1s7/)
* [You don't have any account connected in the app yet](https://doc.common-services.com/en/article/error-failed-to-obtain-marketplace-no-account-connected-1e5wkx6/)

To successfully connect the account, ensure that the account meets the following requirements:

1. You must have a Professional Amazon Seller account. (Individual accounts not allowed).
2. The account is fully active and no further account and payment verification on Amazon is required
3. You have the appropriate user access to install a third-party app. You can check this on your Amazon account (Settings > User Permission History > User Permissions)

If your account meets all the requirements, it's best to do some troubleshooting - https://doc.common-services.com/en/article/troubleshooting-connection-errors-1p0401k/

If you continue to see the error even after doing troubleshooting, reach out to us through live chat and provide the following information:

* .myshopify.com URL
* Amazon region selected
* Screenshot of the error
* Full error text
* Incident ID
* And the current Seller Central marketplace selected