Activesync Issues Exchange 2019

Question

Hi I have a Exchange 2019 server running and my mobile device will not sync with any user. Functionality with Outlook client and OWA is working perfectly. When i add my account to outlook app on my phone i can connect to Exchange, my folders appear but with nothing in them and exchange never syncs? When i try to send an email i get some sort of time out error "EasSendFailedTransientException: An EAS Send command failed: The EAS command failed with Status ServerError, Code =110 and HttpStatus OK. The EAS command failed with status ServerError Failure code 547" Can anyone please assist me here?

Answer 1

Ok so i have fixed the issue, it seems the accepted domain has issues with wild card characters.
Eg. .domain.com.au
I change our accepted domain from ".domain.com.au" to "domain.com.au" and everything seem to start working
Wired when documentation said wildcard characters are accepted.

Answer 2

Hi,
Let's start with basic settings:

1. Run Get-CASMailbox user | fl ActiveSyncEnabled to check if Activesync is enabled for the user.
2. Create a new rule and assign the rule to user:
   New-ActiveSyncMailboxPolicy -Name "Test ActiveSync Policy"
   Set-CASMailbox user -ActiveSyncMailboxPolicy "Test ActiveSync Policy"
3. Check default organization setting with Get-ActiveSyncOrganizationSettings | ft DefaultAccessLevel
4. Check the authentification method for Activesync VD: Get-ActiveSyncVirtualDirectory | ft server,basic*
5. Go to IIS Manager and recycle Activesync app pool, go to default-web-site and select Microsoft-Server-ActiveSync, make sure http redirect is not configured.

Please run a test in EXRCA and be free to post the error information back with personal data covered: https://testconnectivity.microsoft.com/tests/Eas/input
And enable Active sync mailbox logging for a testing mailbox and re-connect the mailbox on mobile device, then check the log:

Set-CASMailbox user -ActiveSyncDebugLogging:$True  
Get-ActiveSyncDeviceStatistics -Mailbox user -GetMailboxLog:$True -NotificationEmailAddresses ******@contoso.com  

You can get some help analyzing the log from this blog:https://techcommunity.microsoft.com/t5/exchange-team-blog/under-the-hood-exchange-activesync-mailbox-log-analysis/ba-p/591224

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