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Step 1: Upload Outlook PST file into Office 365

To Import PST to Office 365 manually, follow the underneath steps.

First, open your Office 365 Admin Account and head to Admin Center and pick the Exchange option.
From the window click on Permissions, a list will pop up and you have to choose Organization Management, + sign, Mailbox import-export, Add, and ok.
Now go back on the Organization Management window and choose the Mailbox import-export and click on the Save.
When you are done, move to Admin Center and pick Setup then Data Migration, and hit on Upload PST file.
Step 2: Create a Job and upload Exchange Online

When you hit the upload PST file after that you need to create a job by clicking on New Import Job and type the Job Name and click on Next.
Now check on Upload your data option and hit on NEXT again.
Step 3: Install the Azure tool and use SAS URL

After hitting the next option, a window will pop up. Now, click on the Show Network Upload SAS URL, copy the URL by hitting on the clipboard and paste on the notepad. When it completed go to Download Azure AzCopy and install the tool.
When it is installed, just open the application and type the given command.


This may help,
J Wick