Fallout 1st isn't working.

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

Please check if the subscription is showing up on your Xbox console, please follow the steps below:

"Press the Xbox button on your controller to open the guide, and then select System > Settings > Account > Subscriptions."

Once confirmed, we may need to remove and re-add your account.

" REMOVE ACCOUNT​​​

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1. Press the Xbox button to open the guide. ​​​

2. Select System > Settings > Account > Remove accounts. ​​​

3. Select the account that you want to remove, and then select Remove to confirm. ​​​

4. When you're finished, select Close. ​​​

​​​

POWERCYCLE CONSOLE​​​

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1. Turn off your console by holding the Xbox button on the front of the console for approximately 10 seconds. The console will turn off. ​​​

2. Turn your console back on by pressing the Xbox button on the console or the Xbox button on your controller. ​​​

​​​

ADD ACCOUNT​​​

​​​

1. Press the Xbox button to open the guide. ​​​

2. Select your gamerpic in the upper-left corner of the screen, move all the way down and select Add new. ​​​

3. Enter the Email address and the password.​​​

4. Read the Microsoft Service Agreement and Privacy Statement, and then select I Accept. ​​​

5. Follow the steps to configure your Sign-In & Security preferences to add your Microsoft account to your Xbox console.​​​"

Were you able to see it as "active"?

Yes with expiration date. Did everything above and nothing happened?

Were you able to see it as "active"?

fallout 1st is a sub, it will only work with the account that ordered and pays for it. simular to passes in games are account specific only.

The link Jesse gave you is for the XBox version, this one is for XBox Game Pass on PC:

Fallout 1st (Windows) — Fallout 1st (Windows) – One-Month Membership | Xbox

Note the (Windows), that's the difference.