Hi @Csomi2006 ,
According to your description, the exact cause of the problem cannot be determined at this time. There is one solution for you:
We recommend that you create another account in the Microsoft 365 admin center. Then click on the account, and on the account interface, give the account global administrator rights through the Manage roles.
Then use the new account to enter the Microsoft 365 admin center,
Click your old account, and in the OneDrive interface, click the Create a file link.
Access the user's OneDrive as a secondary administrator by clicking the hyperlink to open OneDrive in a browser.
Thanks,
Yanli Jiang
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