ScanPST is designed to repair PST files, not OST files. If your OST file is corrupted or inaccessible, ScanPST may not be able to resolve the issue. In such cases, an OST to PST Converter Software can help recover mailbox data and export OST to PST format.
Using a reliable OST to PST Conversion tool, users can convert OST to PST emails and access important mailbox data in Outlook. A dedicated OST to PST converter is often a practical option when the OST file cannot be repaired through ScanPST.
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https://blog.perfectdatasolutions.com/how-do-i-convert-outlook-365-ost-to-pst/