3539680 - 'Registration not available' warning on a class with additional information 'Self-registration not available'

Registration button is greyed out on a class and class says 'Registration not available' due to reason 'Self-registration not available' despite the followings:

• class is being present in the user's library
• class is having empty seats
• self-registration is allowed on the class
• user has "Enable Shopping Account" checked

**Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental**

SAP SuccessFactors Learning

Unable to register, button greyed out, class registration, permission, Add to Learning Assignments, Registration not available, self-registration not available , KBA , LOD-SF-LMS-SCH , Class - Scheduled Offerings , Problem