You can create a Group Calendar in Microsoft 365 by following the step-by-step instructions for either of the methods described in this post.

Next, you'll need to create what Microsoft calls a Work Or School Account (with your custom Microsoft 365 domain) rather than using a free Microsoft account.

You can make a Microsoft account for free through Microsoft's website by using a pre-existing email address or creating a new one.

Microsoft has made the lives of Teams users easier by merging the work and personal accounts in the same app.