We are still having issues signing in to Sketchup for schools - https://edu.sketchup.com/app?auth=msft
Our domains have both been Whitelisted - @ntschools.net and @education.nt.gov.au
We are using Microsoft Azure AD and have grant Admin consent. Reached out to Microsoft support and advised to check with Sketchup support on why the token issued by Azure AD is being rejected by Sketchup.
See below image we get when signing in on Sketchup.