...
Searching for Jira issues doesn't populate any results neither in the Salesforce Visualforce page nor in the Jira Issues component.
...
...
Environment
Jira Cloud
Cause
The integration user has to has to have the Browse Browse Project permission permission granted to all of the bound projects.
Resolution
Ensure that all of the bound projects (Jira icon > Salesforce > Bindings) have been granted the Browse Project permission permission.