That letter was probably issued in early 2020 before the bank updated its processes to accommodate that changes made by the SECURE Act which became law on December 20, 2019. Before the SECURE Act became law, your required beginning date (RBD) for RMDs from a traditional IRA would have been April 1, 2021. With the changes dictated by the SECURE Act, because you did not reach age 70½ before 2020 your RBD became April 1, 2022 as rjs indicated, April 1 of the year following the year you reached age 72.
With regard to satisfying your RMD, since you have been receiving distributions you just need to make sure that the distributions during 2021 and 2022 satisfy the RMD requirements for 2021 and 2022.
