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Fix MyApps Portal TypeError t.toLocaleUpperCase Is Not a Function

Muhammad Talha Oct 20, 2026 868 views

Question details

Users experience an error where custom application groups fail to load correctly in the Microsoft MyApps portal.

How to Fix MyApps Portal TypeError: t.toLocaleUpperCase is Not a Function

Product: Microsoft MyApps Portal
Device & OS: not provided
Scenario: Accessing custom application groups after successfully logging into the Microsoft MyApps portal.
Observed behavior: Custom application groups display blank icons and throw the error 'TypeError: t.toLocaleUpperCase is not a function'. Reloading the page does not resolve the issue.

Before you start

Ensure you have your Microsoft Entra ID (formerly Azure Active Directory) tenant details handy, as this specific issue typically requires administrative backend support to fully resolve.

Solution 1Recommended

Escalate to Azure Active Directory Support

Since this is a backend script error within the Azure app portal, escalating the problem to the dedicated Microsoft Q&A channel is the most effective approach.

The 't.toLocaleUpperCase is not a function' error is a JavaScript exception indicating that the portal's code is attempting to manipulate a variable that is not a string. Because this occurs within Microsoft's hosted environment, it cannot be fixed through local computer settings.

Visit Microsoft Q&A

Navigate to the official Microsoft Q&A support channel specifically for Azure Active Directory.

Post a New Thread

Log in with your Microsoft administrator account and click on 'Ask a question' to create a new thread detailing the error.

Provide Tenant Details

Include relevant details in your post, such as when the issue started, the specific custom app groups affected, and the exact wording of the TypeError to help engineers diagnose the problem quickly.

Escalate to Azure Active Directory Support

Response Time: Microsoft Community Moderators and Azure engineers typically respond to technical backend queries within 24 to 48 hours.

Solution 2

Perform Basic Browser Troubleshooting

Before waiting for official support, rule out the possibility of a corrupted local browser cache causing the script failure.

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Frequently Asked Questions

What causes the 't.toLocaleUpperCase is not a function' error?

This is a JavaScript execution error that occurs when the web portal attempts to perform a text case conversion on a data type that is not a string. In the MyApps portal, this usually stems from a backend data mismatch or a bug in the portal's update.

Can clearing my browser cache fix the MyApps portal blank icons?

Sometimes. While clearing your cache and cookies can resolve local script conflicts or outdated web assets, persistent errors like this across multiple devices usually require intervention from Microsoft Azure support.

How do I report an issue with the Microsoft MyApps portal?

You can report backend application portal issues through the official Azure Active Directory Microsoft Q&A support channel, where dedicated moderators and engineers can investigate your tenant-specific problem.

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