In order to correctly share your data with Nozzle, if you're not the account owner, the account giving you authorization needs to have the Campaign Manager: View & Edit permission in Seller Central or Amazon Advertising (formerly AMS) for your account. That is usually everything required to return the profile for the account(s) you have access to.

In order to do this, the account giving the authorization can navigate to the top right to Settings => User Permissions = > Manage Permissions for your account.

Here we can see fragment of the permissions interface in Amazon Seller Central but it would be a similar process in Amazon Advertising.

You'll see that for this user they have "View & Edit" checked for the "Campaign Manager" permission for the account. This will have been set by the owner of the account who provided access.

Without this permission, Nozzle is unable to fetch any data related to this account via the APIs provided by Amazon.