AT&T has only itself to blame here. The minute the Broadcom buyout of VMWare was signed, this was an obvious outcome. They should have been migrating away already. Instead, in typical corporate fashion, they waited until the last moment and let technical debt pile up into a mountain which is about to collapse and bury them in costs. That's OK though, I imagine a lot of high level managers got their bonus for keeping costs down in previous years and now it's the current managers who have to deal with the problem.
Best of luck to the IT staff who will have to deal with this shit-show.