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If PowerShell doesn't work, try checking the old Flash-Based interface since not all the features from that have been ported to the HTML-5 yet. - Sorry, can't check this myself at the moment.
That was it. I am so used to the HTML 5 interface now, that I forget that some features haven't been implemented yet. Thank you very much.
I upgraded to 7.0 and am having the same issue where the join button is greyed out
I ran the Set-PowerCLIConfiguration -ParticipateInCeip $true command and got the prompt to accept changing the value and hit [A] Yes to All when prompted...when you do Get-PowerCLIConfiguration there is nothing to indicate that this has acutally been changed.
When I go into the HTML 5 interface...it still shows greyed out and not joined.
Flash UI is not an available option any longer with 7.0
I finally got this to work. I was originally logged in with an account that has Admin rights, but for some reason it did not work. I had to log in with the actual "Administrator" account...and then the option was no longer greyed out.