Whitelist school domain in office 365

hello, would you please whitelist our school domain

because i only got my personal email trusted, and all other emails in the school office 365 could not sign in
" i had added the application of SketchUp for school in office 365, and all emails been added as a users in the application"
school emails domain: randschools.edu.sa
website: www.randschools.edu.sa / www.randschools.com

i had requested this before in other article but probably no one saw it.
thank you