Instructions further can be found here: https://docs.microsoft.com/en-us/windows/mixed-reality/altspace-vr/getting-started/creating-and-linking-accounts
Using Web Projector with Microsoft Accounts
When creating or updating your account, keep in mind that there are still features that require an AltspaceVR “password” such as the Web Projector. You can sign out and generate a password that is separate from your Microsoft login that allows you to use the Web Projector. This password is separate to your Microsoft Account login. But would allow you to log in using e-mail & password. This is a workaround for the Microsoft Login update in May 2022.

If you’ve created an account with MSA and don’t have an AltspaceVR password, sign into https://www.altvr.com/, go to your profile, and then click “sign out and get a new password”.