Failing to retrieve attachments from EWS server

Question

We have a file attachment synching feature that is used by an Outlook add-in (OfficeJS). The EWS token and URL are fetched using [3] and [4]

We fetch attachments using EWS SOAP API calls detailed here[2]. However, we have noticed that some of these calls fail randomly and will succeed in subsequent retries. I do not think this is related to signed emails [1]. Is there a rate limit on the EWS SOAP API calls?

EDIT:

The response returned by a direct SOAP request to the EWS endpoint:

                <m:GetAttachmentResponseMessage ResponseClass="Error">
                <m:MessageText>The specified attachment Id is invalid.</m:MessageText>
                <m:ResponseCode>ErrorInvalidAttachmentId</m:ResponseCode>
                <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
                <m:Attachments/>
            </m:GetAttachmentResponseMessage>

Reference

[1] EWS: Retrieving attachments from signed emails

[2] https://learn.microsoft.com/en-us/outlook/add-ins/get-attachments-of-an-outlook-item#use-ews-to-get-the-attachments

[3]https://learn.microsoft.com/en-us/office/dev/add-ins/reference/objectmodel/requirement-set-1.7/office.context.mailbox#ewsurl-string

[4] https://learn.microsoft.com/en-us/office/dev/add-ins/reference/objectmodel/requirement-set-1.7/office.context.mailbox#getcallbacktokenasyncoptions-callback

Is there any error shown on the response when it fails - like in the response headers / body? — Brian Clink, Nov 19 '18 at 18:59
Did you also check the response headers? Sometimes there are error messages inside of the response headers. — Brian Clink, Dec 19 '18 at 15:18

Failing to retrieve attachments from EWS server

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