Cannot read properties of undefined (reading 'UI') on https

[BennieMatthee]

The AJAX Control Toolkit <20.1.0.0>

The installation method

• Installer
• [X ] NuGet package
• A custom build from the source code

Site loads without any issues locally and in production with http.
When loading the site on https I get javascript errors.

<asp:ScriptManager ID="ScriptManager1" runat="server" EnableCdn="true" ></asp:ScriptManager>

When I inspect the page elements it looks like the cdn is using https as expected.

Browser(s) used

Both Chrome and IE have the same result, however Chrome shows errors in console. IE does not.

A site deployment method

• VS development web-server,
• [X ] IIS