@daniel-dennison here is a reference item from the IRS --> Publication 5257 (en-sp) (Rev. 2-2021) (irs.gov)
As @DoninGA said TurboTax may be wrong in flagging ITIN as expired --- this document suggests that IRS will contact you in writing when an ITIN is about to expire etc. Please read through this document --- it is also available in multiple languages .
Hope this helps
pk
