"Add-on is not licensed!" error message in Visualforce Page and Configuration Page
When accessing the JIRA Cloud for Salesforce configuration page or a Visualforce page in Salesforce, an error message appears saying the "Add-on is not licensed!"
Any version of Salesforce & JIRA Cloud Connector
A new license or renewed license has been applied to the Salesforce & JIRA Cloud connector in JIRA and the cache is not refreshing to the database.
Since the cache has not refreshed, you have to manually do so by disabling and re-enabling the Salesforce & JIRA Cloud Connector with the following steps:
Go the gear icon > Add-ons > Manage add-ons
Look for Salesforce & JIRA Cloud Connector
Expand the section and click Disable
Then, re-enable the add-on.