Make sure to disable your pop-up blocker, I was faced with the same issue and found out that my browser was not allowing the next screen to open which held the Auth 2 token. I know this is a bit late, but I'm hoping it can be of help for someone.
Thanks,
Colt
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The base user role should be able to share their searches and dashboards out of the gate. You can adjust the capabilities of an existing (or create a new) role and give it to that user to get a more fine tuned access control by navigating to Settings -> Users and Authentication -> Access Controls . From there you can see the different roles and after clicking into one, you have the ability to see each of the capabilities.
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