To solve this problem, check that your MTurk and TurkPrime accounts are properly linked. You can do this by comparing the Amazon Account Name, Access Key ID, and Secret Access Key on file with TurkPrime to the credentials associated with your MTurk account. To find the information on TurkPrime, go to the profile icon in the header of the main page and click on Mechanical Turk Account.
To change which MTurk account is linked to TurkPrime or reset your account settings, select either Edit your Amazon Credentials or Delete MTurk Settings to unlink your MTurk Account from your TurkPrime account. Afterward, try relinking your accounts by entering your Access Key ID and Secret Access Key.
If neither of these steps resolves your issue, please contact our Customer Support: firstname.lastname@example.org