I am not able to access my Appian Community Account

so while trying to login I am getting following error and I am writing this from my different community account! 

I tried to mail Appian Community to but still I haven't received any support !!! 

error : 

Sorry, you can't access https://community.appian.com because you are not assigned this app in Okta. If you're wondering why this is happening, please contact your administrator.

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