@shwift 

Hi,
If you can't log in to the Deco app, please refer to the link below to troubleshoot.
What should I do if I failed to login Deco App?
 

If the problem remains, please help confirm the following information.
1. Please turn off the Wi-Fi on your phone and log in to the Deco app with your account via the mobile data, and can you log in to the Deco app.

2. What's your Deco's model number? Do you have internet when connecting to the Deco network? Please send me the MAC address of the main Deco via private message.

3. What's the model number and OS version of your phone? What's the version of your Deco app?

4. Please send me a picture of the error message that appears on the Deco app when logging in to it.

Best Regards