If you are using Internet Explorer 11 (IE 11), please add Microsoft.com to the compatibility view sites by following the steps below:
If you have tried the steps above and continue to experience the same issue, try deleting the temporary internet files and cookies by doing the following:
If the previous steps do not work, you can also try the following:
For more information, see the Partner Support Community.
Note: As an alternative to the Simplified Association Process, you can also try associating from your Partner Membership Center account (https://partners.microsoft.com/).