The 99-0999999 gambit seems to work for 2021 returns reporting UK pension income. The 99-9999999 that TurboTax suggests doesn't work and apparently hasn't worked for years.
This 99-0999999 thing is one example I came across. The other example was going round and round with some 1099-MISC income we had that TurboTax insisted must be a new line of self-employment business. Eventually resolved by inaccurately characterizing it as a manufacturer's incentive.
