Iphone not synching up with office 365 account

I recently moved 8 users to Office 365 Business Premium & after a couple of glitches along the way, finally got everything where I want it (well, still waiting on old SharePoint data), but everything is running along smoothly, except for one glitch.
I've got one user who cannot see any of the folders in his inbox when on his phone. Even stranger, is the fact that other users aren't having this issue. They all have iphones through Sprint, if that would matter & I've tried tinkering with all synch related settings I could find - push, fetch, mail days to synch & still nothing other than the top level inbox. I even tried installing the outlook phone app & still nothing, although this does work with other users like it's supposed to. If I log into the 365 site, everything is there, as it should be - is there anything in the properties of the folders I want displayed?
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Todd NelsonSystems EngineerCommented:
Made any attempt to remove the mail account from the phone and create a new one?

Additionally, if using the native mail app, try the Microsoft Outlook app to see if you have the same issue.
gromackAuthor Commented:
Yes, I have removed it & added it back in. I have also tried the outlook app with the same results.
Todd NelsonSystems EngineerCommented:
Does it work or not on another phone with the suspect mailbox?
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gromackAuthor Commented:
I've tried it with my iphone & same results, that's why I was wondering if it would have been something in the mailbox settings or folder properties?
Todd NelsonSystems EngineerCommented:
That's an odd one.  There isn't anything that I know of regarding mailbox settings that would prevent folders from being viewable or accessible via EAS.

Was an O365 license assigned to the suspect user?
Paul SmartSenior Support EngineerCommented:
Sounds like Device Number issue.

Exchange limits the number of devices an email account can be accessed from.
If this mailbox has been accessed from other devices (laptops/phones/workstations/etc), it could be that.

A few things to check.

1. Login to Office 365 Exchange Control panel (outlook.office365.com/ecp)
Click on Mobile Device Access and check device is not listed at all under quarantined devices.

2. Login to the mail account via the Outlook webmail service (outlook.office365.com)
Click on the Cog > Click on Mail under Your App Settings
On the Left hand side click on General > Mobile Devices

Delete any devices not being used (or have not synced in a long time).

That SHOULD resolve the issue :D
gromackAuthor Commented:
Figured it out, rather than importing folders into the new inbox, copying them into a new folder did the trick.

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Todd NelsonSystems EngineerCommented:
Requester resolved issue.
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