Slack & Asana integration in a permanent loop

Whenever I attempt to use the Asana integration in Slack it tells me that I need to connect Asana to Slack:

But when I attempt to Connect Asana to Slack I get the following message:

If I hit continue I receive the following:

But when I go back to Slack I get the same message to connect Asana to Slack.

What can I do to troubleshoot this?