The error you're receiving is a more complicated one and requires getting specific details about the cloud account in question, and you will need get in contact with Atlassian Support so we can log into the system and take a look at the individual account to fix this.
I have created the following Support Request on your behalf, and CC'd the technical contact of the account so we can get things started, Let me know in this thread if you are not able to access the support request:
Also as a bit of follow up, we have the this Bug Report on this issue, noting it is closed out and to contacting Support as the issue is not reproducible between accounts and requires a custom investigation and fix per occurrence:
Hi Atlassian community, My name is Max and I work on the product integration team at Atlassian. I am pleased to announce the early access program for the Jira Cloud add-in for Outlook. This add-in...
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