Hi iCloudPlusProblems,
Thanks for reaching out to Apple Support Communities.
It sounds like you’re having an issue with sharing your iCloud+ with 2TB storage plan.
We’re happy to assist.
We recommend checking out the steps in the section titled "Share iCloud+ with everyone in your family" from the article here: Share iCloud+ with your family - Apple Support
On your iPhone, iPad, or iPod touch
In iOS 16 or iPadOS 16 or later:
1. If you haven't set up Family Sharing yet, set up Family Sharing.
2. Go to Settings > Family.
3. Tap Subscriptions.
4. Tap iCloud+.
5. Follow the steps to share your existing plan.
6. Use Messages to let any family members with an existing iCloud+ plan know that they can now switch to your shared iCloud+ plan.
In iOS 15 or iPadOS 15 or earlier:
1. If you haven't set up Family Sharing yet, set up Family Sharing.
2. Go to Settings > [your name].
3. Tap Family Sharing.
4. Tap iCloud+.
5. Follow the steps to share your existing plan.
6. Use Messages to let any family members with an existing iCloud+ plan know that they can now switch to your shared iCloud+ plan.
The reason why we’re recommending the steps above is because they directly address the issue you initially posted about: you’re having an issue with sharing your iCloud+ with 2TB storage plan.
Should the issue continue, follow-up with the steps in this article: How to share purchases with your family - Apple Support
Please let us know the outcome after giving the above steps a try.
Cheers!