Hi MichelleBh. I already did all of the above steps and contacted customer support. After several phone calls and many hours, they are unfortunately no closer to finding out why some of the 'view and pay invoice' links function and some say 'link unavailable'. The last customer support agent I talked to said they are still working to try to find a resolution.
Additionally, he mentioned that QB will look into this issue to see if it is a problem other users are experiencing. If that is the case, and the problem is widespread enough, QB will put a team on trying to find a solution. From reading the above posts, it looks as though this has been an ongoing, unresolved issue for other users so I hope QB will soon find an answer. That being said, if any users out there are reading this post because you have experienced the same problem, I encourage you to reach out to support to let them know they need to resolve this error for everyone.
I will keep you posted if QB is able to solve this for me. :-)
