"Create Jira Issues" and "Associate" Buttons are visible to admins only

Summary

Under Salesforce Lightning Experience, the Create Jira Issues and Associate buttons are only visible to admins.

Cloud

The user's profile doesn't have the Apex Class access permission enabled for JCFS classes.

Server

The user's profile doesn't have the Apex Class access permission enabled for JSFS classes.

Cloud

Identify the users who aren't able to see the Create Jira Issues and Associate buttons.
In Salesforce, go to Setup > Users > Profiles > click on the users' profile.
Look for and edit Enabled Apex Class Access.
Make sure all JCFS classes have been added to the Enabled Apex Classes column.

Server

Identify the users who aren't able to see the Create Jira Issues and Associate buttons.
In Salesforce, go to Setup > Users > Profiles > click on the users' profile.
Look for and edit Enabled Apex Class Access.
Make sure all JSFS classes have been added to the Enabled Apex Classes column.