Is there any way to merge you old Xbox one account with your new series X account so I can...

There isn't a way to transfer your old items/account to your new Microsoft Account. What do you mean when you say you transferred your security settings from your old account to a new account? You can change the email/info of your Microsoft Account,
but your old Profile is going to be tied to that old Microsoft Account, and there are no ways to merge or migrate that data.

Hi George! My name is Stephanie and I'm more than happy to help you out!

Here's what you can do in order to share your Xbox Game Pass on both Xbox Series X and old Xbox One console.

Sign in to your account where you have an active Xbox Game Pass on Xbox Series X console > press the Xbox menu button > go to Settings > Personalization > My home Xbox > Select Make this as my home Xbox.

That way, you will be enabling the game and subscription sharing from your account and all of the accounts that will be using the Xbox Series X console will have the benefits of your Xbox Game Pass subscription.

Sign out of the console then sign in on your old Xbox One console. In this way, you will be using the old Xbox Console where you can frequently use your account. As long as your account is signed in on your old Xbox One console, you will still have access to your Xbox Game Pass benefits while your kids can play your game pass on Xbox Series X console.

Kind regards,
Stephanie

Hi there.

Thank you for reaching out to the forum. Unfortunately not. It is not possible to merge your accounts.

Hey there Skippy! I understand you have a question about merging two accounts. It sounds like you'd like to keep your old account, but use your current WLID and GT with it, is that correct? If so, you can simply change the WLID to something else, and then
change your old account to this WLID, no sweat.

As for the GT, you'd have to essentially pay for two changes: one on the new account to free up the GT, and one to change the old account to the desired GT. This would run you 1600 MSP.

If this isn't what you were looking to do, please let me know, although as Bowski pointed out, there is no way to directly merge two accounts together. Let us know, thanks!

DLC and add-ons are linked to your account so as long as you can play the games on the new Xbox one series x then it shouldn't be a problem. Xbox had said that the Series X will be backward compatible so it is great!