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mSecure5 Fails to Launch after Authentication

I've downloaded and installed mSecure from the Microsoft store (I own the Pro version). The first time I did this, I inadvertently copied an out-date authentication code to the clipboard and then selected the clipboard as the authentication method. I received a message that I'd been authenticated and then the app disappeared. When I relaunched, the splash screen displays but the app fails to start. I've uninstalled/reinstalled, run wsreset.exe, and every other troubleshooting method I could think of (e.g., deleting mSecure from the C:\Users\[username]\AppData\Local\Packages) but every time I enter my username and password, the app goes and fetches the authentication code I entered the first time, says I'm authenticated and goes off into the ether. Where is the authentication code stored and how can I change it?

Hi Lynne,

Thank you for contacting us and I'm sorry about the issue you are experiencing.  Having an invalid authentication code or account key will not allow you to sign in or authenticate your account nor cause the app to crash. It would simply result in an error message that the code was invalid. Unfortunately, it seems that there is an issue with either the Microsoft Store or a Windows system file(s) in your system. To resolve this issue, try going throughout our Microsoft Store app issues guide here and restarting your computer afterward:

Additionally, I would recommend running the System File Checker tool to repair missing or corrupted system files. For steps on how to run the System File Checker tool, refer to the following link:

If the issue persists, we recommend that you perform a clean boot. A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software and driver conflicts. For steps on how to perform a clean boot, check the following link:

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