Allow to rename username from Azure

Hello,

We have multiple domains in Azure, and we use "firstname@domain.tld" for our admins and users.
So it can happen that we have multiple people with the same first name.

The first one received the username "stijn". But the 2nd account is named "stijn-azure". Don't know how a third will be named, but it's not that professional looking to the end user.

Or is there a way to modify the username being sent over from Azure? So that we can use "Firstname Lastname".
Also, the possibility to use capitalized letters in the username would be nice. Or to have a display name which is then used to show to the end-users.

regards,
Stijn

Edit: Never mind the capitalization. It seems every word in a username is capitalized automatically. Although there are some last names where not every word should be capitalized.

No files, tests, or entry points are identified. Start by locating the Azure account-provisioning path and determine how usernames are generated or displayed; done should include a supported way to use a chosen username or display name for users from multiple Azure domains.