As your Sumdog school account is now managed by your school through Wonde, you will not be able to approve/invite/request teachers from joining the school account. The reason for this is that your Sumdog school account will now be locked.
However don't worry any new teacher joining your school will only need to have their data shared with us through Wonde. They will then be added to the school according to the data in your school's MIS.
Note: To access Sumdog through Wonde your school would first need to share your school data with Sumdog through Wonde's secure sync.