There was a known problem with this from around the time you reported this problem. However believe this was a temporary problem that we were able to fix. I found a similar thread over in https://community.atlassian.com/t5/Marketplace-Apps-questions/Can-t-install-Jira-Cloud-plugin-in-Slack/qaq-p/858623 that had the same issue.
Sorry for the delay in response, but this should be working again now.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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