Sophos Mobile / EAS Email Error

Question

Hello everyone, 
 I have the problem that I can't get email access on a smartphone. The error and informational messages are: 
 2023-04-24 08:00:29.448 [EAS] INFO ActiveSyncIdCache_EAS-AEVN - try to resolve active sync id "XXX" with username 'USERID'
2023-04-24 08:00:29.586 [EAS] ERROR ActiveSyncIdCache_EAS-AEVN - Mobile reported error while resolving XXX: found 2 matching devices, but should be exactly one
2023-04-24 08:00:29.965 [EAS] INFO ActiveSyncIdCache_EAS-AEVN - smc server could not resolve active sync id "XXX", next resolve will be at 2023-04-24T11:00:29.965+0200
2023-04-24 08:00:29.965 [EAS] INFO InboundHandler_EAS-AEVN - active sync id 'XXX' has permission UnknownActiveSyncId 
 The user himself does not have any Active Sync IDs in Exchange. In addition to the device we are trying to connect, there is another tablet that can successfully access email. 
 There are a large number of people in my area who access both smartphones and tablets at the same time. 
 How can I approach a solution? I am thankful for every help. 
 Best regards, Oliver

Oliver Kühnast · Accepted Answer

Good Morning, 
 Thank you for all replies and try to support! 
 After some analysis, we were able to determine the problem: we incorrectly requested a client certificate for authentication, although none was distributed. We work with a Trusted Certificate. All new devices or the newly distributed e-mail client no longer contained the previous certificate and the devices were no longer legitimate. 
 Unfortunately, the error message was quite misleading and only a Sophos partner came to this conclusion via detours. 
 In the end everything works as it should. Solution: Disabling the requirement for a client certificate. 
 Best regards, Oliver

Sophos Mobile / EAS Email Error

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