Web sign in does not work in 9.18.4

Hello everyone, I'm having an issue with logging in to Mendix version 9.18.4. It doesn't matter whether I start the app from the browser (open in Studio Pro) or directly from the version selector or open version 9.18.4 immediately. Whenever I click on Sign In and the window for web login opens, I am not redirected to the browser and no browser window opens (see attached video, which shows the way it usually should work). I have also tried changing the default browser, but it still doesn't open a window. Thank you in advance for any possible solutions.  
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