Unable to find an entry point named 'GetAvailableCoreWebView2BrowserVersionString'

[paiden]

Im embedding the WebView control in a .Net based Outlook addin.

On my machine and some customer systems everything runs fine. But on some other customer Systems I get the following exception:

Unable to find an entry point named 'GetAvailableCoreWebView2BrowserVersionString' in DLL 'WebView2Loader.dll'.
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.GetAvailableCoreWebView2BrowserVersionString(String browserExecutableFolder, String& versionInfo)
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.GetAvailableBrowserVersionString(String browserExecutableFolder)

[Remaining stack trace truncated]

The runtime version on the system where the exception happens is: 90.0.818.42

But I believe the runtime version should not matter, as I am delivering WebView2Loader.dll with my Setup?

Could there be some Bitness issue (I think on some systems outlook is 32Bit and not 64Bit). But I am not completely sure about that.

What can I try to diagnose this issue?