This post fromMiniToolprovides some solutions.
This notification usually pops up when there is a problem parsing an element in the software.
How to fix the Event ID 86: CertificateServicesClient-CertEnroll on Windows 11/10?
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This post provides all answers for you.
Then, lets see how to fix the EventID 300 failed to parse element issue.
After rebooting your PC, reinstall Microsoft Office from the official website.

Fix 2: Repair Microsoft Office
Microsoft provides an effective built-in quick repair tool to repair Office.
Therefore, you’re free to follow the steps below to repair Office to fix the issue.
Click theUninstall a programbutton underPrograms.
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Find and right-tap the Office program to selectChange.
ChooseQuick RepairorOnline Repairbased on your situation according to the on-screen instructions.
Here are some fixes for you.

Here is how to do that:
1.
Typecontrol panelin theSearchbox to open it.
Go toPrograms>Uninstall a program>View installed updates.

Then, find the latest update and right-click it to chooseUninstall.
Then, follow the on-screen instructions to finish it.
You had betterrun a virus scanto detect the virus or malware.
Go toSettingsby pressing theWindows + Ikeys together.
Go toUpdate & Security>Windows Security>Open Windows Security>Virus & threat protection.
In theCurrent threatssection, clickQuickScan.
you’re free to try the solutions one by one that we mentioned in this post.
If you have any different ideas to fix the issue, you might share them in the comment zone.