When configuring the Mail app with an Exchange sync profile (using MDM), the initial installation succeeds, however, updates to the payload do not contain the password configuration for the account.
Completely removing the profile from the device and then re-pushing succeeds; the error is only seen when an update to the profile is made.
We have informed Apple of the issue and this article will be updated once we confirm a resolution in iOS. If you have Apple Care Support you may wish to reach out directly to Apple to learn more details around the status of this issue.
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