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In most cases it means, that the Add-On is unable to access instance issues to perform search on them. Usually, this is caused by having specific permissions schemes.

If you have non-default permissions schema, you must make sure that the Add-On's system user has enough permissions to view issues.

For more information please refer to this Atlassian Article

Similarly, if you've modified default permission schemes for projects and issues, you may need to add access for add-on users. You can add atlassian-addons-project-access to add-ons can perform as designed. To do this, navigate to your administration console and click Issues > Permission schemes. Click the name of your scheme, and under the Operations column, click Add and enter atlassian-addons-project-access from the Project Role drop-down.