How many "give cards" can I redeem using my reward points?

There's not a limit per day, but you can only redeem up to 550,000 points per year.

If you're referring to Microsoft Rewards points, you would want to check the gift card you're wanting to redeem and it will show you how many points you need. https://account.microsoft.com/rewards/redeem/all
The points themselves do not have a monetary value.

With Microsoft Rewards points, once you earn enough points you can redeem an Xbox gift card to add funds to your account and then use those funds to purchase a gamertag change. The support person you spoke to was misinformed on how many points it takes.
Prior to the currency system Microsoft used points as currency and at that time it cost 800 Microsoft points to change a tag. Microsoft points are not the same as Microsoft Rewards points though so you would need enough points to redeem a $10 gift card as
well as a little extra to cover tax.

I appreciate your response. But this does not apply. I know how to purchase a gift card, but I want to use the credits that were applied to my account automatically by Microsoft when I earned reward points. I earned these points using BING and playing
the games. SO, once I earned enough points, I chose to redeem those points by purchasing a gift card. However, instead of receiving a digital code via email the way I used to, it now automatically adds the gift card amounts to my MS account. The problem
is that I wanted the gift cards to give to someone else... not myself. What is the point of choosing a gift card option to redeem reward points if you are going to give them to yourself??????

MICROSOFT changed the way we use to be able to use the Gift cards. I now have credit in my account that I wanted to give as a GIFT. If I wanted to use the points myself, I would have chose a different reward option! The whole point of choosing GIFT CARD
is to give! Microsoft is screwing up by changing this policy. If they think I am going to use my paypal or visa to purchase anything from them again … after this... they are crazy. I earned those points and want the GIFT CARD for a GIFT!

How do I use the credits that were applied AUTOMATICALLY to my ACCOUNT when I chose GIFT CARD using my rewards points? I want to give the credited amount to my son and granddaughter, which I used to be able to do... now I CAN'T!

I AM FURIOUS! It is Christmas Eve and I go to print out the email like I have done for the past 3 years, and it doesn't have the digital code. It has a statement about it being placed on my account. SO again, I ask.... how do I use those credits to give
a gift card, which is what I already purchased with my REWARD POINTS! ANYONE????

On the rewards app, i have the auto redeem on for the £5 gift card and it’s taken the point of my account but hasn’t given me the 5 pounds. I used the rest of my points for a £10 gift card on the app and that worked.

The points have now been given back instead of giving the £5 gift card