To get rid of errors like [pii_email_7a89c71943231bfaad6b] from your M outlook, you should know what the real cause behind this error is and what this error is about. You are unable to find the exact cause of this error unless you get help from the MS Service center, and that is something you should keep as your last option. There are many different reasons this error can be occurring, and it could be because of a different version of MS windows or just due to some pirated software that you have recently installed.
Based on all the possible causes given below are the steps you can take to remove this error
Start with removing multiple accounts
The main and most common cause behind this error is multiple accounts logged in to your computer, so you will have to get rid of these extra accounts from your computer. Even though you can use multiple accounts from MS Outlook, it can still cause problems like this error [pii_email_7a89c71943231bfaad6b]. So, start with logging out of these extra accounts at first.
Move on to clearing caches and cookies
If the last step hasn’t worked, then you need to move on to removing all the caches and cookies from the computer. Once you have cleared them out, the error [pii_email_7a89c71943231bfaad6b] will fix on its own, and all you need to do is to restart your MS outlook again.
Changing the version of MS Windows
If the previous step isn’t working, then you need to use it on another version of MS Windows. If the MS outlook works at another version and then the update of MS Windows is required.
If nothing is working, you can try a repair tool for this purpose. The tool will determine the problem and fix the error [pii_email_7a89c71943231bfaad6b] on its own.