Redeeming vbucks brought via Microsoft site to give to nephew

The vbucks would have been directly added to your account. You can try submitting a refund request to see if you can get the purchase refunded. If they give the option to "Purchase as a gift" you can buy them that way which will send a digital code. Otherwise, you'd have to purchase a digital code or a regular gift card from another retailer.

I have just brought v bucks for my son and my Microsoft account but it's not bringing up a redeemable code - how long should I leave it? His xbox is not linked to my Microsoft account.

If you purchased the vbucks from the ingame store or from within the store on Xbox then the vbucks are automatically applied to the account that they were purchased from. You dont get a code.

It can take up to 24 hours to receive the funds after redeeming them. If you don't get them in that time, check your order history on the redemption page of the rewards site and it'll give the option to either resend it or give a code to redeem. If not, you'll want to contact Microsoft Rewards support via the contact link at the bottom of the site.

Check your order history on the redemption page of the Rewards site. It will either give the option to resend them or it will list a code to redeem there. If not, you'll need to contact Microsoft Rewards support via the contact link at the bottom of the Rewards site.

You do not get the vbucks straight away, you usually have to wait around 10 working days before a code is sent via xbox live message for the vbucks for you to redeem.