Symptoms 

After you configure a proxy server in Microsoft Exchange Server 2019 by using the Set-ExchangeServer -InternetWebProxy cmdlet, the modern attachment feature doesn't work. If you send an email message that has a modern attachment in Outlook on the Web (OWA), the following event is logged:

From: Microsoft Outlook <microsoftexchange329e71ec88ae4615bbc36ab6ce41109e@contoso.com>

To: <the user who just sent out a modern attachment>

Subject: Your recipients couldn't be given access to the file <file name>

Body: The location where the file is stored isn't available.

The message was sent, but recipients might not be able to access the attachment.

Try opening the file <filename> and giving others access to it from its current location.

Resolution 

To fix this issue, install the following cumulative update: 

Cumulative Update 14 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.