High school drafting design teacher here. My students are using SketchUp For Schools across multiple devices, browsers, and operating systems. I see the same problem on Mac and PC, in Edge and Chrome. I can’t figure out what the common thread is. What happens is as follows:
What are we missing?
If different devices and OS are affected, it might come from your network security parameters.
SketchUp needs ports 80, 8080 and 443 to be opened so that every online feature can work.
See with your network manager if he/she can add exception or change rules
I’ll second that. could also be in the security parameters of your student’s machines.
are they using their own ? or are the computers the school’s ones ?
you’re using sketchup for school, have you tried both inside the webapp and on the independent website https://3dwarehouse.sketchup.com/ ?
Hey! Looking into this now. Thank you for bringing it up!
Ok. I am seeing what you are seeing when:
Accessing the EDU app using Chrome on my Mac using Microsoft authentication
I was able to get it to work:
Using my Google Authentication worked as expected
Using Firefox as my browser seemed to work as expected
Please let me know if you are able to test any of those.
We’ll keep looking into the issue I’m seeing with MSFT + Chrome and keep you posted.
Thank you for your support!
We are a Microsoft School, so we are not able to access it with Google Authentication.
We can try Firefox, but historically we haven’t had a lot of success.
We checked the parameters on an alternate wifi point we have access to changing the ports and we did not have any success.
Will try the browser-direct version of 3D warehouse. Thanks again and keep us posted!
Can confirm we can access 3D Warehouse from the browser-direct version, but what a pain to download every model and insert it manually. Any word on a possible fix?
We have cornered the issue. The engineering team is looking for a solution and the fix will be prioritized.
Curious if you had any luck with Firefox.
Glad to hear it. Thank you so much for your prompt action!
As for Firefox, today we tried Edge, Chrome, Firefox, Safari (just to be sure - it never works with 3D Warehouse), Opera, and even DuckDuckGo. Tragically, NOT ONE of them worked 
Although I should mention that there are days we can rotate through the different browsers and get ONE of them to work.
Hey! Quick update, I ran some tests on the fix today and looks like the next update will get things working again. I’m imagining it will go into production by the middle of next week. I will be at AIA in Boston, but I will look for the update in the evening.