See this IRS website for the CP30 notice - https://www.irs.gov/individuals/understanding-your-cp30-notice
Contact the TurboTax Audit Support Center for assistance with the CP30 you received.
See this TurboTax support FAQ for how to contact the TurboTax Audit Support Center - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-audit/turbotax-audit-support/L6AcMoN...
