I've typed in the link but now I see this message:

As your link is unique to you, this error most likely has shown because the linked in the URL search bar doesn't exactly match the unique link in the text message. In this case, please double check the link your GP sent you in the text and that this matches exactly with the link in the typed URL at the top of the web page. 

Hint: Sometimes "o" and "0" can look the same or even "i" and "1"