Anaplan Certified Model Builder Maintenance

What is the requirement for maintaining Anaplan Certified Model Builder status?   I received my Anaplan Certified Model Builder credential June 10, 2020 with an expiration of Dec 31, 2020.  LV1 and LV2 have 2-year expirations and the Anaplan way has none. I'm working on LV3 leading up to Solutions Architect, but in the interim I'd like to keep my current cert.  

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