Blank page while previewing app from Studio

Hi community, When previewing a particular app within Studio - not Studio Pro -, a blank page appears instead of the regular landing page. I suspect this issue has to do with SSO. Normally, viewing within Pro also initially leads to a browser page with a 404 error. But fortunately you can circumvent this by replacing, for example, in the URL / SSO with /login.html. However, the URL in Studio is of a totally different order (eg, So what is the way to fix it in this case? 
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