I get this link: https://goo.gl/AaJzRW.
When clicking on this on the Kubernetes panel, it goes to https://cloud.google.com/partners/partnercredit/?PCN=a0n60000006Vpz4AAC
And that page just says:
Your eligibility could not be confirmed.
Please contact your Cloud Partner to get a valid URL to use to redeem your partner credit. If you are not working with a Cloud Partner, you are still eligible for the $300 credit for signing up for a free trial .