You should be able to find all assets when searching for them in the Jira agent view.
If you don’t see specific assets or any assets, there are two possible ways to fix the issue:
Change Snipe-IT Configuration
If you use the JSM portal view to create a request, only assets assigned to the currently logged-in user or assets not assigned to anyone are shown.
If you always want to show all assets in the JSM portal as well, you can uncheck the Assign assets to Jira users in the Snipe-IT for Jira configuration:
Update Asset Field Setting (Team-Managed Projects Only)
When you switch Snipe-IT installations you might have to update the asset field setting in your team-managed projects to show the assets of the new Snipe-IT instance.
Project > Project settings > Request types
Select the request type where the Snipe-IT asset field is shown
Select the Snipe-IT asset field
Select the asset types you want to show (if you want to show any type select all asset types)