As with many websites, D2L is ending support for various legacy (older versions of) web browsers.
You may see a message similar to the following:
Happily, the fix is simple: update your browser. You can do a web search similar to “how do I update YourWebBrowser” to find the steps
Also, note that Internet Explorer and Legacy Edge users will not be able to access D2L unless they update to a newer version of Edge or download a new web browser.