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In 2017, Mastercard introduced new card number ranges that begin with 2s. Your Turbify Store has always been compatible with these new 2-series cards; however, Mastercard ran many of these tests before compliance was required, and are just now sending out the notices.
If you receive such a notice from Mastercard, please reach out to them at mc_2bin_compliance@mastercard.com. Your email should look something like this:
Mastercard should respond fairly quickly to state that they consider your store compliant.
If you also receive an email from your merchant account provider (MAP) about your perceived non-compliance, just reply with the confirmation of compliance that Mastercard sends in response to the email above.