DuoOIDC InvalidPathException Illegal char <*> at index 9: classpath*:\net\shibboleth\idp\plugin\authn\duo\duo-client-factory-bean.xml

[Rod Widdowson]

I’m away from my desk but I have a vague memory of bottoming this out last year…

Maybe check for back slashes in all your paths and replace them with unix style forward slashes?