If a user is not visible on the User Management page, it is very much clear that  it is because their product type is HRA. Users with the HRA product type do not appear in the standard User Management section in Admin Account .

Instead, these users are managed through the HRMS module. You can find them by clicking on the HRMS tool icon, where HRMS users are listed.

Access to Add Attendance is controlled through User permissions in the HRMS module. Once the required permission is enabled for the user, they will be able to add attendance successfully.