Outlook 2021 does not connect to Office 365 on one Account

Question

Using testconnectivity.microsoft.com brings the error on one user mailbox and

also Outlook 2021 does not connect. These Error Occurs more often the last days on

different Tenants. Most of the time only one user is affected.

The next day it works again without changing anything.

Many thanks in advance

Frank

Der MAPI-Adressbuch-Endpunkt auf dem Exchange-Server wird getestet.

Fehler beim Test des Adressbuch-Endpunkts.

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Testschritte

Der Vorgang "Namen überprüfen" des Adressbuchs wird für Benutzer ******@XX.de anhand von Server "outlook.office365.com" getestet.Beim Versuch, den Namen aufzulösen, ist ein Fehler aufgetreten.__Weitere DetailsAusnahmedetails: Nachricht: The request was aborted: The request was canceled. Typ: System.Net.WebException Stapelüberwachung: at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at Microsoft.Exchange.MapiHttp.ClientAsyncOperation.<>c__DisplayClass58_0.<BeginGetResponseCallback>b__0() at Microsoft.Exchange.MapiHttp.ClientAsyncOperation.Execute(Action action)

Answer 1

Hi,@Frank Schrader

Thanks for posting your question in the Microsoft Q&A forum.

I need to confirm those questions with you:

1.Can you log in to OWA?

2.Do you have the same problem logging into Outlook on another computer?

3.Are you using a company email address? Or exchange mailbox?

Your answer helps us to narrow down the question, thank you for your support and understanding.