First, please check to ensure you have the correct user permissions.
Next, check to see if the profile is appearing as a different name.
If the seller has ever changed the name of their selling or advertising account, the API will reflect the old/original name of the account (this is what you will see in AdLabs).
Tip: In the Amazon Ad Console, when switching accounts, you may see the old name flash for a millisecond before it updates in your browser.
If you are 100% positive that you have the correct permissions and the advertising profile isn't appearing at all (including other names), then this is a confirmed bug from Amazon's end:
We've been pressuring Amazon to fix this for months now, they've told us "it's complicated."
We hope this is fixed soon!! :)