Exchange OAuth different certificate(s) have been found

[bc1000]

Hi everyone,

since yesterday I get the following warning every hour in application log. We have a hybrid exchange connection running fine for a month. Besides this warning in the on-prem exchange everythings seems to be fine.

event id 2008:

MSExchange OAuth

When retrieving metadata from the url 'https://accounts.accesscontrol.windows.net/.../metadata/json/1', different certificate(s) have been found.

and 

When retrieving metadata from the url 'https://login.windows.net/xxx.onmicrosoft.com/federationmetadata/2007-06/federationmetadata.xml', different certificate(s) have been found.

It startet yesterday after this daily event:

MSExchange Certificate Notification
A round of expiration check has finished. The next round is scheduled at "09.06.2020 20:37:18".

I check oauth connection this way and both sides were successfull (https://docs.microsoft.com/en-us/exchange/configure-oauth-authentication-between-exchange-and-exchan...)

[#2]

a few seconds before the first warning I see the following info message in application log:

event: 2013

The authentication configuration information for trusted issuer EvoSts has been updated.

The authentication configuration information for trusted issuer ACS has been updated.

[#3 · Accepted solution]

Warning is gone. Stopped yesterday in the evening without any changes from my side.