I bought the s series under my old account, can I change it to my main account?

Sorry to hear about it! Buy you will get your game!

Hi there Smith welcome to the community forum! Christopher here, an Xbox fan just like you and has been on Xbox for years already. I would really love to make your day by helping you out. Unfortunately, we cannot send games from one account to another, except if you buy them as a gift, but you can ask for a refund and buy the games on your main account!

https://support.xbox.com/help/subscriptions-bil...

My mom bought them as a gift but used the wrong email account for them. She confused my email with my Xbox email.. she talked to Xbox and they said they couldn't transfer the games, sigh. So she had to get a refund. She's upset bc it was supposed to be a surprise for me.. When she realized what she did she had to tell me about it..

It seems to be a little more complicated with the Series s and x now as the account that to be set to home on the console that you'll use the most for other accounts to use some/all of the DLC.

My Series X is set to home on my main account and the other accounts can use any digital games and DLC no problem but on my Series S it's problematic to what DLC can be used since it's not my main accounts home console.

Is there anyway I can change a name of an old account of mine and then change my main accounts name to that?

Yes. If you change the name on the old account it'll free up the gamertag for use so you can change it to that.