This command could not find the MASTER_ACCESS_TOKEN from system-seed when the customers are upgrading from version 2.4 sequentially up to 2.7.

I had to manually look up the system-mysql database for the master access token and populate it in the system-seed secret.

mysql> select value from access_tokens where  name="Master Token";

Reported by: rhn-support-cabeywar

https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.7/html/migrating_3scale/upgrading-3scale#annotations:4f033783-0873-4c49-89c4-3bb7fe961da0