DKIM support for personalised email addresses on Microsoft 365 Personal & Family

New mailboxes with personalised domains on Microsoft 365 Personal & Family were discontinued for new users as of November 30, 2023, but there are still a lot of users using them

The lack of DKIM support is a problem, since there are increasing efforts to make SPF & DKIM mandatory in order for email to be received. Microsoft themselves acknowledge the need to enable DKIM: https://techcommunity.microsoft.com/t5/exchange-team-blog/authenticate-outbound-email-to-improve-deliverability/bc-p/4043722

So when will Microsoft enable DKIM support for personalised email addresses on Microsoft 365 Personal & Family?