Failed to retrieve access token

Hi – Your plugin seems like a great idea in theory but in practice for me and many others it seems it simply doesn’t function – I have followed your installation instructions implicitly and continue to get ‘Failed to retrieve access token‘ I have also created a token from within Bitly and pasted it into the plugin setting thinking that this may work as a plan B, but no, the same error – can you please advise on my next move – is this plugin compatible with the latest version of WordPress? I also notice no reply to someone with the same problem in this forum – is this forum still active? I must say I am surprised with the lack of attention to enquirers submitting problems, especially from such a major company. I wait in anticipation.