Miscellaneous topics that do not fit into specific categories.
Hello
You cannot really merge accounts.
This is the farthest you can do - close the Microsoft account with Gmail address, bring the gmail address into your live.com's Microsoft account as alias.
By doing so, it means - you can log into your live.com account with either the live.com email, or the gmail.com address.
However, it also means, you cannot bring any purchases, data under the gmail.com Microsot account over, that part of the merge is not supported.
If you don't have data or purchases to worry about, then this is what you can do:
Launch web browser in incognito mode, go to https://account.live.com
sign in with gmail, go to Your Info > Sign in preference, Add an alias.
Create new: this will allow you to use the native domain outlook.com to create a new alias.
Once added, make this new alias your primary alias, then you can delete the other email as alias, and gmail is free from this Microsoft account instantly. Then you can use this method to close this Microsoft account: https://support.microsoft.com/en-us/account-billing/how-to-close-your-microsoft-account-c1b2d13f-4de6-6e1b-4a31-d9d668849979