The new standard applies to sequence lists in all patent applications with a filing date from 1 July 2022. Sequence lists in applications filed before 1 July 2022 must comply with WIPO's standard 25.
You can read more about the new standard in WIPO's FAQs. The tool WIPO Sequence developed by WIPO may help you prepare your sequence lists compliant with ST. 26.
If you have further questions, please contact examiner Doris Roth.