IE11 and using PKCE Okta widget

I’m using currently using the Okta widget with a SPA application. The client authentication mechanism configured on the app is PKCE. This works in Chrome, FF, Edge, but not IE11. In IE11 I’m seeing the following console error:
SCRIPT5022: AuthSdkError: This browser doesn’t support PKCE

Doing some searching and there is not a ton of answers on whether PKCE is supported in IE11. Is it possible to get this working? If not, when is the recommended alternative?

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