UiPath Studio and Assistant do not open Sign In window

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1

Hello everyone,

I’m facing an issue with UiPath Studio and UiPath Assistant.

When I click on “Sign In”, nothing happens — the authentication window does not open and no error message is shown. The same behavior happens in both Studio and Assistant.

Details:

  • UiPath Studio version: 24.10.9
  • Windows 10/11
  • Issue started suddenly
  • UiPath was reinstalled, but the problem persists
  • WebView2 was checked/reinstalled
  • Chrome is the default browser

I also checked the Studio logs and I can see errors happening during the online validation process when trying to authenticate, but the login flow itself never starts.

Has anyone experienced this issue before or knows what could block the Sign In window from opening?

Thank you in advance for any help.

2

Hi @Sara_Beatriz_Bento , have there been any changes recently to Studio or Assistant? What errors do you see in the logs?

3

Hello @Raluca_Laica,

Thank you for responding.

  1. I did not make any intentional changes to the Studio or Assistant settings recently.
    The issue started when the Sign In window stopped opening. I have tried:
  • Reinstalling UiPath Studio and Assistant
  • Reinstalling WebView2
  • Clearing identity and cache folders
  • Running as administrator

None of these changed the behavior.

  1. Here are the relevant errors from the UiPath Studio logs:

[ERROR] NotLicensedException: No license exist for this installation
UiPath.Licensing.Library.Extended.Exceptions.NotLicensedException: No license exist for this installation
at UiPath.Licensing.Library.Extended.Implementation.OnlineLoader.UpdateAsync(…)
at UiPath.Licensing.Library.Extended.Implementation.LicenseProvider.UpdateOnlineLicenseAsync(…)

This error appears every time I click Sign In but the login window never opens.

If more log lines would help, I can provide them.

Thank you!

4

Hi @Sara_Beatriz_Bento

This issue happens when the authentication window fails to open, often due to WebView2, cached settings, or security software.

  • Close Studio/Assistant and rename or delete %localappdata%\UiPath\UiPath.settings.json
  • Clear WebView2 cache in Edge
  • Try running Studio/Assistant as administrator
  • Temporarily set Edge as the default browser
  • Check firewall/antivirus for blocking

If it still doesn’t work, a full uninstall and cleanup of %localappdata%\UiPath and %programdata%\UiPath before reinstalling can help.

5

Hi @Sara_Beatriz_Bento

Have you tried installing the newest version of Studio 2025.10.X?
Is you machine shown as Connected under Orchestrator Connection in Assistant Preferences, or is that part not reachable at the moment?

Also wild guess but could you check:

  • Open “Run…” (Winkey + R)
  • Type:
control userpasswords2
  • Click the Advanced tab and the Manage passwords button
  • Check if there are any references to UiPath under saved Windows credentials, and consider deleting them

Regards
Soren

6

Double check if indeed the Chrome is the default browser in your system.
If you have a proxy in place in the machine, you may need to add the HTTPS_PROXY variable for your proxy server in the system settings.

7

Hi @Sara_Beatriz_Bento,

A system restart will do the job.

Thanks

8

See if chrome is set as default browser.

Also as a workaround - Try login using orchestrator url and machine key.