I'm getting this error while using the plugin in google sheets to import issues from JIRA.
"Hmmm ... looks like we stumbled a bit, please try again or contact Atlassian support if the issue persists. (§GS-404)"
What worked for me was to create a new blank spreadsheet and do my JiraCloud import there.
Additional details here: https://community.atlassian.com/t5/Jira-questions/Re-Re-Unable-to-use-JIRA-add-on-in-Google-sheets/qaq-p/1833687/comment-id/505041#M505041
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