Issue Subscribing via URL in Remote Desktop (MSI) App — RDS On-Prem, No Azure

Question

Starting May 27, 2025, the Remote Desktop app for Windows from the Microsoft Store will no longer be supported or available for download and installation.

We have an on-premises RDS farm (no Azure integration), and I’m currently testing the Remote Desktop (MSI) version as a replacement. However, I'm running into an issue when trying to Subscribe using a Workspace URL.

When I enter the subscription URL, I receive the following error:

"We couldn't find any Workspaces. Please check that the email or URL provided is correct."

The URL is correct — it works perfectly with:

The current Remote Desktop app from the Microsoft Store

RemoteApp and Desktop Connections via Control Panel

I also checked the logs located at:

C:\Users\<username>\AppData\Local\Packages\Microsoft.RemoteDesktop_8wekyb3d8bbwe\LocalState\Logs

However, these logs are unhelpful — all events have ID 0, and the event bodies don't contain any information.

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Has anyone successfully subscribed using a Workspace URL in the Remote Desktop (MSI) version? Is there an additional configuration needed for non-Azure/on-prem RDS environments?

Any guidance or shared experience would be appreciated!