Acces token is only possible to refresh for admins of the respective channel. 

The site owner has to go in team settings in the top left and then in content settings > channels. 

The pink warn symbol next to the channel indicates the acces token needs to be refreshed. By clicking on the channel you get to channel settings. Click there the button 'refresh acces token' and confirm the message in the opened window. Save the settings. 

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