Incorrect QR code user feedback

When entering an incorrect QR code, the user doesn't get any feedback.

obfsvpro://127.0.88.148:443/?cert=5KzjBcTef4%hAh๐๑๒ฦAha;bcd`aqjCCCtN0peVK4xkcrT1GE1O8pwVW4DUEbXJJWE9x6ZH0dGQ&fqdn=ito.noe&kcp=0&auth=KannoSugako_u6wk8%2BQAAAxDTpNOjjS4Q%3D%3DDD