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"Can't connect. Please try again later" error when searching people in OWA in Exchange Server 2019

Symptoms

With Microsoft Exchange Server 2019 installed on a Windows Server 2019 (Server Core), when trying to find a contact in the global address list (GAL) in Outlook on the web, you receive the following error message:

Can't connect. Please try again later

Cause

The default language and locale of Windows Server 2019 aren't US English. The Advanced Query Syntax (AQS) Windows module requires the installation of the corresponding language pack on the server.

Resolution

Install the English language pack using the corresponding language .cab files from Language Pack ISO for Windows Server. Check if the package is installed by using the following steps:

  1. From a Command prompt, run the following command:

    intl.cpl
    
  2. On the Formats tab, make sure that the format is set to English (United States).

    Screenshot of the window for format settings.

  3. On the Administrative tab, select Copy settings and make sure that the settings are also set to English (United States).

    Screenshot of the window for region settings.