Slack: Error: OAuth State mismatch, please try again.

[chaim1221]

When trying to subscribe to a repository, I get the following error:
Error: OAuth State mismatch, please try again.

Steps to reproduce:

1. Create a Slack workspace
2. Create a GitHub organization
3. Create a public repo in the GitHub org
4. Install the GitHub Slack integration to the Slack workspace
5. /github subscribe your-organization/your-public-repo
6. Receive error.

Please have a look and let me know if you can reproduce.

Steps I have tried:

1. Signing out of the Slack workspace and signing back in.
2. Removing the GitHub plugin and readding it.
3. Making sure I am signed into GitHub.

What I haven't tried:

1. Signing out of GitHub.

Why? Because OAuth should prompt me to authenticate if I need to, and it's not related. There's something wrong with how it's generating the state.

There are no open or closed issues that mention this error.

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[chaim1221]

I tried signing out of GitHub. Same result.

[drortirosh]

Had the same problem, but found a solution:

• When you click the "Connect to Github" button in slack, a link is opened in a browser
• Copy that link into an incognito window
• Now clicking the button (in the browser) will ask you to auth into github, and the connection is successful.

[chaim1221]

Glad you found a workaround, but it's not a solution. Nowhere in the OAuth2 spec does it say "the user must open an incognito window." ;)