If you're seeing the following screen, when trying to log in to your Quantive Results account indicating you are not invited to the account you're trying to log into:

Then most probably you've ended up entering (or bookmarking) an incorrect login URL. 

Note: if you have recently changed your account domain and have previously saved a bookmark to access your Quantive account with the old domain, you will receive this error.

To login to your Quantive Results account, the best way is to use your account domain and append /login to it (e.g. mycompany.gtmhub.com/login or mycompany.us.gtmhub/login, respectively).
Alternatively you can go to Quantive.com and click on the Account drop down menu,

the select Quantive Results Login.

If you're still unable to login following the above instructions, click on the Error stack for this error link. Copy the information it provides, and contact Quantive Results support at support@quantive.com or via our Public Issue Tracker.