in authui-container/src/admin-ui.ts [450:460]
private handleUnrecoverableError(error: Error) {
// Remove spinner if available.
if (this.loadingSpinnerElement) {
this.loadingSpinnerElement.remove();
}
this.containerElement.style.display = 'block';
// Use a more informative/actionable error message than the default one.
this.containerElement.innerText =
error && (error as any).code && (error as any).code === 'auth/operation-not-allowed' ?
MSG_GOOGLE_PROVIDER_NOT_CONFIGURED : error.message;
}