It can be hard to import a PST file into Office 365 because there is no direct upload option for PST files. When I had to move my Outlook data to my Office 365 account, I had the same difficulty. I first tried doing things by hand, but they were slow, needed technical procedures, and sometimes caused emails to go missing. After that, I utilised the
WholeClear PST to Office 365 Converter, which made the whole thing easy and speedy. The software linked seamlessly to my Office 365 account and moved all of my emails without any problems. In my experience, it worked well and saved a lot of time. I didn't have to worry about losing data or having folders that were broken. When everything was imported, everything was just like it was in the PST file, with attachments and formatting.
Things I liked about it:
Simple steps and an easy-to-use interface
Import directly from a PST file to an Office 365 account
Keeps the folder structure and style of emails
Allows for the migration of many PST files at once
No loss of data during the process
Can handle PST files that are quite huge
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https://www.appclonescript.com/pst-to-office-365-migration/
https://www.boycat.co/blogs/66580/Why-Does-PST-to-Office-365-Migration-Get-Stuck