The December 13 SEC filing used to be listed on Avaya's investor relations website. It's gone now. You have to look on the SEC site.
8-K Filing: https://www.sec.gov/ix?doc=/Archives/edgar/data/0001418100/000141810022000112/avya-20221213.htm
Powerpoint: https://www.sec.gov/Archives/edgar/data/1418100/000141810022000112/ex991cleansingpresentati.htm