EWS Connection is not working anymore

[DominikA9522]

Hello all,

we're using the OnTime Group calender https://ontimesuite.com/resources/microsoft/documentation/ for additional functions for Exchange Online.

This solutions worked for the last months.

Starting with Tuesday 05th December this tool stopped working because the user synchronisation via EWS is not working anymore.

The tools connects via an Enterprise Application and an Impersination user.

We get following EWS Respsone when trying to sync a Microsoft 365 group or a distribution list:

EwsResponse http://schemas.xmlsoap.org/soap/envelope/">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"/>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">No results were found.ErrorNameResolutionNoResults0

I tested the same scenario with the OnTime Server with a developer tenant and there it works.

We also tried to resolve Distribution lists via EWS Editor it works well in the Dev Tenant but not in our Prod Tenant.. 

Do you have any idea why the Nameresolution isn't working anymore?

What can we check? 

Thank you very much

[#2]

Did you connect their support?

[#3]

Hi,

yes i connected the M365 support. But they said EWS is not supported. I should contact the Community..

[#4]

I mean support of OnTime suite.

[#5]

yes did already. And they say it's configured as it should.
The same server and configuration works as well with another tenant.

We see also the same behaviour with EWS Editor. We can resolve the Groups in the test tenant but not in the prod tenant