New databases that are created in cPanel are not visible in PHPMyAdmin, but if you assign a user to it and access it as that user, then you can use it.
The first thing to check is if the database is visible via CMD:
mysql -uCPANEL_USERNAME -p
If the database IS NOT visible from both the terminal and PHPMyAdmin then:
- Restart the cPanel user password from WHM
If the database IS visible from the terminal but not from the PHPMyAdmin then:
Home > Server Configuration > Tweak Settings, click on the Software tab and enable phpMyAdmin information schema searches.