What version of Chrome are you using? Note that per Supported browsers : you will need to use the latest or the latest-1 version of Chrome to create activities.
You could also always email us at email@example.com with your account details and the page URL and we can take a look.
I'm not able to share anything in regards to that but, this isn't just one specific URL but all published pages from our AEM prod, dev, and stage environments. I feel like this may be a browser issue as I can currently am able to produce tests/activities in Firefox and Microsoft Edge.
I would agree with your assessment since it's only happening in that specific browser probably some security feature/setting.
Mihnea Docea | Technical Support Consultant | Customer Experience | Adobe | (:: 1 (800) 497-0335
We are also facing the same issue and sometimes when I load any page in VEC it redirects me to adobe experience cloud login page URL (www.mywebsitedomain.experiencecloud.adobe.com/exc-content/login.html) inside VEC with a blank gray screen