Clarification on Author when creating a branch in Azure Devops

I created a branch from the master branch in Azure Devops, but the Author name and date, were the same as the master branch, shouldn't the author name be my name?

A branch in Git is just a reference to a particular commit. It contains no information about an author. The author information is coming from the commit the branch currently refers to.

When you created the new branch MailMergeService, it was a reference to the same commit as master was referring to, so it is showing the same author information.

If you create a new commit for the MailMergeService branch, the author will be taken from that commit, which can then be different from the author that is shown for master.