Cannot connect Confluence to Slack

[Gareth McGregor]

Whenever I try to Log into my Jira account through slack, the following message pops up: 

{"error":{"message":"Invalid state","code":"INVALID_STATE_TOKEN"}}

[Summer.Hogan]

Hi @Gareth McGregor - welcome to the community. There is an answer on the community about this. If you scroll down in the comments you will see a suggestion. to clear your cookies for Confluence and Slack and enable 3rd party cookies for the browser. 
https://community.atlassian.com/t5/Confluence-questions/Trouble-connecting-slack-and-confluence/qaq-p/1483317#:~:text=Try%20removing%20your%20cookies%20for%20Confluence%20and%20Slack%20and%20try%20again.&text=I%20had%20the%20same%20issue,cookies%20on%20this%20authentication%20site.