Is it possible to combine two microsoft accounts?

This article is also very informative on the things you can do with your Microsoft account's alias. https://support.microsoft.com/en-us/help/12407/microsoft-account-change-email-phone-number

You can set up an alias log in for your xbox gamer tag but that is if the gmail account isn't linked to another gamertag at all. Here is a link how to https://support.xbox.com/en-US/my-a...nt/change-email-sign-in-for-microsoft-account

Sorry, but no. It's not possible to merge accounts and nothing can be transferred between accounts.

It's not possible to combine two xbox live accounts

Sorry to hear it. However, I'm afraid that it's not possible to combine two accounts or transfer content from one account to another.