Can't get Exchange inbox to sync on Android Outlook app

I have been dealing with this issue for a year. I am an IT Tech and I cannot get my email to sync on my phone and the other techs can't figure it out either. I downloaded the Outlook app on my phone and set my work account up manually (adding server and domain name, etc) and by choosing Exchange. But the inbox will not sync. I tried it on my wife's phone as well but it also will not sync the inbox so I have a feeling that there is something wrong with my account. My coworker logged into his account on my phone and his inbox immediately synced, so I don't think it is an issue with my phone but possibly an issue with my account. I even deleted my email account in the EAC and created a new one but I am having the same problem. My organization uses Exchange 2013. 

Things I have tried on my phone- restarting phone, changing settings in the Android Outlook settings: battery is set to unrestricted, "allow data usage while data saver is on" is set to on, and turning off "remove permissions if app is unused".

Is there a setting in either the Microsoft 365 admin center or the Exchange admin center that I need to change?