Recorded 14 Oct 2026 at 12:55 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.
Availability (free/busy) fails for delegated mailboxes in Exchange hybrid deployments that use Graph API only
In a classic hybrid deployment that's configured by using ConfigureExchangeHybridApplication.ps1 -UseGraphApiOnly, availability (free/busy) information fails when a remote mailbox user accesses a delegated on-premises mailbox and checks the availability of mailboxes that are hosted in Exchange Online. When this issue occurs, you experience the following symptom, depending on the UI. Classic Outlook: The following error message is displayed: “Your server location could not be determined. Contact your administrator.”; Outlook on the web (OWA): The following error message is displayed: “No information"; Exchange EWS logs: The following error is recorded: "The remote server returned an error: (403) Forbidden." EXNL-GraphWebRequestProcessingException:WebException.
What it said
- Published
- 2 Oct 2026
- Product
- Exchange
Recorded links
What changed
First observed 14 Oct 2026No field changes in the recorded history.
Cite this recorded revision to keep the same title, summary, facts and links when the page changes.
A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.