Today I suddenly noticed that my ActiveCampaign application in zapier was disconnected. Zapier asks to reconnect to the application, when I do so I get the following error. I think I've tested everything, changed the API data in ActiveCampaign but I keep getting the same error. How to fix it, the error appeared suddenly I did not make any changes at that time.
I have exactly the same issue as you, so seems like it’s an Active Campaign or Zapier issue. I know that doesn't help you resolve it but at least you know you are not the only one!
Yeah im getting this as well going from Clickfunnels to activecampaign. Pretty sure its a zapier or activecampaign issue
Hi there!
I noticed on ActiveCampaign's status page that they had a maintenance update recently: https://status.activecampaign.com/history.
It seems they've resolved the issue. Can you check and confirm if everything's good on your side?
Thanks! 
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