Logins and cookies for students

Hi, 
We've had a support query coming in: 

A teacher in California is able to launch the Express Embed modal and login, but his students are not. In our application, they have exactly the same permissions. It seems to be a limitation from their IT department. I imagine blocking the student accounts from using cookies with Embed.
Email from him after some investigation - where "Create Video in Adobe Express" is the Embed workflow:
 We discovered that I (with teacher credentials) am able to access the "Create Video in Adobe Express" - however my students cannot. They are able to work with Express in its own browser tab at new.express.adobe.com, download files to their workstation, then upload to Stornaway. However the "Create Video in Adobe Express" is the most seamless option which I'd like them to use. As such, I think this is an issue on our end. 

So in summary the students can use the full version of Express in its own browser tab but not the Embed. The teacher can use both. So I'm guessing the problem is that the IT department restricts cookie use for users with student roles, in a way that specifically affects Express Embed but not full page Express. It's possible this restriction is related to their interpretation of California children's privacy laws.

What are the cookie (or other) requirements that might restrict Express Embed login in an organisation  that controls such things on a user role basis, and is there any way around it in our Express Embed config?

Schools and universities are a good chunk of our large user base of tens of thousands of users of Express Embed in Stornaway, and although this hasn't been reported before, it's possible that teachers on free accounts are just sucking it up as "IT restrictions" and not reporting it. It's also possible that it's more likely to be restricted by school district IT in California because of the laws. Or perhaps it's a new change.

UPDATE:
Possibly related to the Safari issue reported by another customer that I raised here:
https://community.adobe.com/t5/adobe-express-embed-sdk-bugs/login-to-express-embed-not-working-on-safari/idi-p/15183667

Ru