Microsoft Action Pack acquisition is shown on the partner center. After purchase, tokens provided on the center need to be redeemed to be showed in Office. Please go into your Partner Center, benefits tab if i'm not mistaken. Products for the Action Pack acquired should show there with the token to redeem. Below the token there should be a link to activate that token to your Office 365 tenant.
Please remember that tokens, be them action pack acquired or prepaid contracts, always need to be activated first and then their token redeemed. It's not automatic as you might want to renew but not use the token right away :) If, for any reason, the token is not available, please contact GPS, Partner support.