Lumia 550 devices.
It appears that following a recent software update a number of our users have had trouble synchronising Mail on their Lumia 550 devices.
When attempting to open mail they are advised that there credentials need updating - these are entered and accepted and then loops back to state that the credentials are out of date.
A soft reset has resolved the issue, but there is potential that over 300 users are affected.
There accounts have been checked and they are not locked and the password they entered to renew their credentials as been confirmed.
Mail not working on the following
OS 10.0.14393.67
Ver 1607
We updated the phone to
OS 10.0.14393.189
Ver 1607
Mail still not working after the update
This has only affected users with a Windows device
Access to Office 365 is not affected using a PC