Welcome back to the community, @esy_cari2020! This support article outlined below should help you solve your issue:
Just so you know, there are two servers (the Global server and the EU server) for KoboToolbox. If you have an account on one of the servers and try to open your account through the link for the other server, you cannot log in. So, you’ll need to use the correct URL to get the blank forms to your app.
For the Global server account, try login through this link
For the EU server account, try login through this link
Let me know if you still have issues getting the blank form to your app.
