Hi,
I suggest you refer to this support article:
When you need cloud storage for individual users beyond the initial 5 TB, additional cloud storage will be granted as follows:
- When a user has filled their 5 TB of OneDrive storage to at least 90% capacity, Microsoft will increase your default storage space in OneDrive to up to 25 TB per user (admins might set a lower per-user limit if they want to). The storage limit will be reset to 5 TB if OneDrive storage utilization drops below 90% of the 5 TB capacity.
- For any user that reaches at least 90% capacity of their 25 TB of OneDrive storage, additional cloud storage will be provided as 25 TB SharePoint team sites to individual users. For more information and assistance, contact Microsoft Support.
- Admins can check for OneDrive eligibility beyond 5 TB via Check OneDrive site eligibility for increased storage.
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