Federated user can log into mailbox, but cannot send email

Hello. Of several dozen federated users with mailboxes in Exchange Online, I have one user who suddenly cannot send mail from his own mailbox, always receiving a, "you do not have the required permission to send from this mailbox." He used to be
able to send, and I've reviewed and compared his mailbox properties and mailbox permissions with other federated users, and I can find nothing to explain these errors. The "NT Authority\Self" identity is listed in the Send-As permission, just as
it is on every other user's mailbox. I even tried explicitly adding the user's account to the Send-As permissions, which made no difference, so I removed it again.
As I said, the user can successfully log into his mailbox and can read his mail, but all attempts to send anything out fail with the same error. Any ideas?
Thanks,
Mike

Turns out the problem was caused by two things:
1) the user has a K2 (kiosk) license
2) in Settings, the user checked the box to "always show the From field"
Apparently, despite the fact that this user had access to no mailboxes other than his own, when you turn on the From field, Exchange apparently does some sort of check for Send on Behalf of rights whenever the user hits Send, even on his own mailbox, and
the Kiosk license excludes the ability to Send on Behalf Of any mailbox.
The bottom line is that, unchecking the "always show From field" checkbox resolved the issue and allowed the user to again send mail.
I'm a bit annoyed by this. If the Kiosk licenses limits a feature like this, then it should remove or deactivate the GUI element, to prevent it from causing this sort of error from occurring.

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