The current error message is absolute in that it thinks there is only one possible way to provide Router twice. In fact, you can get a new instance of the Router in several ways so the error message should indicate the exact failure case with a _potential_ cause. Based on findings in thread https://github.com/angular/angular/commit/0cbbd6aeecda8ea994f1086727e580b813a53d79#commitcomment-80900192 PR Close #47130
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