Forum Discussion
EWS with oAuth "An internal server error occurred. The operation failed."
We have similar problem these days. Getting back the same error which tell nothing.
However, we already use the header "X-AnchorMailbox". Strange is that the error is not permanent but occurs occasionally (these days quite often). Retry after few minutes usually passes.
We also already use `X-AnchorMailbox` and still get the same errors.
Also using the x-anchorMailbox, and still getting the same problem. It is erroring on the finditems call.
</Trace>
2022-08-26 09:29:45.399 [(T06) VSLLC:RestoreArchive:AsProcess08:Schedule(10):Exch] - [TraceFlags.EwsResponse]
<Trace Tag="EwsResponse" Tid="6" Time="2022-08-26 14:29:45Z" Version="15.00.0913.015">
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="15" MinorVersion="20" MajorBuildNumber="5588" MinorBuildNumber="3" Version="V2018_01_08" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />
</s:Header>
<s:Body>
<m:FindItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:FindItemResponseMessage ResponseClass="Error">
<m:MessageText>The mailbox operation failed.</m:MessageText>
<m:ResponseCode>ErrorInternalServerError</m:ResponseCode>
<m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
</m:FindItemResponseMessage>
</m:ResponseMessages>
</m:FindItemResponse>
</s:Body>
</s:Envelope>
</Trace>