VBA & Macro Problems

How to Fix VBA Type Mismatch Errors After Microsoft 365 Updates

Kushani Nimanthika Sep 30, 2026 870 views

Question details

A Visual Basic file triggers a type mismatch error after installing Microsoft 365 updates, despite working correctly in older versions like Office 2019.

How to Fix VBA Type Mismatch Errors After Microsoft 365 Updates

Product: Microsoft 365 / Excel
Device & OS: not provided
Scenario: Running a previously functional VBA macro in Excel after a recent Microsoft 365 software update.
Observed behavior: The macro execution halts and displays a "Type mismatch (Error 13)" dialog, even though macro settings are configured properly.

Before you start

Ensure your work is saved and create a backup copy of your macro-enabled workbook before modifying any VBA code or applying system updates.

Solution 1Recommended

Update Microsoft 365 to Version 2406 or Later

Microsoft identified this specific Type Mismatch bug as an update issue and resolved it in Version 2406 (Build 17726.20126) and later.

Because this error is caused by a known bug in a specific Microsoft 365 release, modifying your VBA code is unnecessary. Updating the application to the patched build will restore functionality.

Open Account Settings

Open any Microsoft 365 application, such as Excel or Word. Click on 'File' in the top left corner, then select 'Account' (or 'Office Account') from the bottom left menu.

Check for Updates

Under the Product Information section, click the 'Update Options' dropdown button located next to Office Updates.

Apply Updates

Select 'Update Now' to force the application to search for and install the latest patches. Wait for the process to complete, then restart Excel.

Update Microsoft 365 to Version 2406 or Later

Bug Fix Confirmed: Updating to Microsoft 365 Version 2406 (Build 17726.20126) or newer automatically resolves this bug without requiring any VBA code changes.

Solution 2

Debug VBA Code Manually for Type Mismatches

If the error persists after updating, or if you cannot update immediately, you may need to manually debug the data types assigned to variables.

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Frequently Asked Questions

Why did my VBA macro suddenly stop working after a Microsoft 365 update?

Microsoft occasionally introduces bugs during routine updates. In this instance, a specific Microsoft 365 update caused a false Type Mismatch error in previously functional VBA files. Installing the subsequent patch (Version 2406) resolves the issue.

What does a "Type mismatch (Error 13)" mean in Visual Basic?

Error 13 indicates that the VBA code is attempting to use a data type in an unsupported manner, such as assigning text to a numeric variable, or treating a standard string as an object.

How can I safely share my Excel file for troubleshooting if it contains confidential data?

Create a copy of your workbook and replace all sensitive data with dummy text or randomized numbers. Test the copied file to ensure the macro still triggers the error before sharing it with a support team.

Will a VBA file created in Office 2019 always work in Microsoft 365?

Generally, yes. Microsoft maintains strong backward compatibility for VBA. However, specific update bugs in Microsoft 365 or newly deprecated features can occasionally cause temporary compatibility issues that do not exist in the standalone Office 2019 version.

Excel & Data Problems