A Microsoft file hosting and synchronization service.
Hello
If you go to https://account.live.com, sign into your account, expand Microsoft Storage, can you share a screenshot of this section please?
Also, which Microsoft 365 subscription do you have? Personal or Family?
For Personal - you only get 1TB.
For Family-
If you signed up before Oct 8th this year, you can share your plan with another 5 users besides yourself, but each user gets 1TB, and this storage cannot be pooled for one user.
If you signed up after Oct 8th this year, you can still share your plan with another 5 users besides yourself, but all of you share a pooled storage of 2TB.
This change is explained here: https://support.microsoft.com/en-gb/onedrive/changes-to-microsoft-365-storage
So, in order to troubleshoot you case, it is very important for us to know which plan you currently have, and if it is indeed Family plan, when was the sign up date.