TT appears to have either fixed or be in the process of fixing this problem for 2023 tax year online users.
Last week when I began working on my 2023 tax return, my NRA wife's valid ITIN (used every year for the past 8 years) was suddenly judged by TT as "invalid."
Now today, suddenly, the same ITIN number, with middle digits of 97 (valid if issued and used consistently after 2013) is now suddenly being accepted by the TT system without any error message.