Moving a contribution from a Roth IRA to a traditional IRA is a recharacterization of the contribution. Section 408A(d)(6)(A) of the tax code sets the deadline for recharacterizing a contribution as the due date of the tax return, including extensions, for the year that the contribution was made. With respect to a contribution made for 2019, that was October 15, 2020, which as passed. Therefore, the 2019 contribution cannot be moved to a traditional IRA, it's too late to do so by 5 months.
It would obtain the $6,000 regular distribution of the 2019 after doing the recharacterizations of the contributions made for 2020 and 2021. This makes it slightly easier for Schwab to calculate the net income attributable to the 2020 and 2021 contributions.
