The research-use confirmation is recorded against your browser, not a personal account — clearing cookies, switching browsers or devices, or using a private/incognito window will ask you to confirm again. That is expected, not a malfunction.
If a lot code will not resolve, a QR code does not open, or a document will not load, the underlying record may not be published yet, the code may have been misread, or something may genuinely be broken. Either way, contact Support with exactly what you were trying to do (the URL or code, if you have it) and it will be looked into directly.