https://support.google.com/edu/classroom/thread/332055592?hl=en&sjid=12055483471141921912-NA

https://support.google.com/edu/classroom/threads?hl=en&thread_filter=(detail%3Auser_role%3Ainstructor)&sjid=17770291018315866787-NC&max_results=60

https://support.google.com/phoneapp/thread/332990761?hl=en&sjid=12122340351222186012-NA

https://support.google.com/phoneapp/thread/332990555?hl=en&sjid=12122340351222186012-NA

https://support.google.com/phoneapp/thread/332990370?hl=en&sjid=12122340351222186012-NA

https://support.google.com/phoneapp/thread/332989109?hl=en&sjid=16807931173282225261-NC

https://support.google.com/phoneapp/thread/332987750?hl=en&sjid=16807931173282225261-NC

https://support.google.com/phoneapp/threads?hl=en&thread_filter=%28detail%3Aplatform%3Aandroid%29&sjid=12631123372443713407-NC

https://support.google.com/edu/classroom/threads?hl=en&thread_filter=%28detail%3Auser_role%3Ainstructor%29&sjid=17770291018315866787-NC

https://flywithair.reamaze.com/articles/navigating-expedias-customer-service-all-the-ways-to-connect