Can i pay the difference from basic to ultimate game pass i made a mistake

No.But you can upgrade which ads time at conversion time for the gamepass

Ultimate just upgrades the time

I was able to cancel for a full refund then subscribed to ultimate very soon after i asked the question. Thank you anyways!

I bought xbox live gold for a year and got a 1 month xbox game pass ultimate gift card from a friend and i converted my gold to the game pass ultimate but i only got a month not the 12 months i payed for in gold so i basically wasted my money.

Thats True, when i upgrade from Xbox Live Gold and Xbox game Pass to Xbox Game Pass ultimate the remaining credit in both subscriptions was converted to Xbox Game Pass Ultimate and i didnt pay the subscription for 2 months since the change was made.

At the third month microsoft start to bill me the subscription of ultimate.

I don't understand the difference. I know I have to download the game. But my son can then play the game with his Xbox account. All achievements earned are under his account, all game saves he made are under his account.

Also, isn't xCloud a streaming service like Netflix or YouTube premium? I pay for a family option on those services and my family members can use it.

I pay for office 365 family, that supports 6 users.

Compared to these services, game pass ultimate doesn't sound that ultimate. At least there should be a discount if I have to buy multiple ultimate passes.

Grtz