Is it an issue with 3rd party cookies? I know Safari on the iPad has that issue.
Try logging into Tableau Server first on the iPad then going back to the embed.
If it works, then that is your issue.
You can disable that by changing "Settings > Safari > Block Cookies" to "Always Allow".
There are a handful of other auth issues that it could be depending on your server.
Nope that did the trick. What on the server side is enabling it to work? Do you know of any way to mimic that?
The "problem" is the cross-domain cookies that Tableau Server is setting from within the iframe.
Basically, Safari defaults to block cross-domain cookies, whereas most desktop browsers do not.
They do this for security reasons, but it can definitely be annoying in our applications, huh?
Here is some more information from the Apple forums: safari does not allowed cross-domain cookies in... | Apple Support Communities