What two conditions can cause this issue?

An email profile is working, but some users are not receiving their emails. In the Workspace ONE UEM Console, an administrator sees that the profile is applied. On the SEG, the administrator notices that the device is not blocked.

What two conditions can cause this issue? (Choose two.)
A . The certificate of the secure email gateway is not valid.
B . The user account is disabled.
C . The device is unable to connect to SE
E . The Activesync is not enabled for these users.
F . The SEG cannot communicate with the mailbox server of these users.

Answer: DE