Forbidden 403 CSRF verification failed. Request aborted. More information is available with DEBUG=True.

I follow the instruction of "ngrok" in official doc to complete mutli-users collaboration. I mapped my localhost:8080 to public site "https://abcdef.ngrok-free.app" for example. And ask other user use this site to access label-studio. (We are in different country, not sure if this is reason).

They can access the page of log in or sign up. If click "sign up" and fill in email and password to create an account, the page will show forbidden 403 as follow:

How to solve this problem? Otherwise I can't collaborate with others.

PS: I create python env with python 3.11. Windows system. First, I execute ngrok to listen to port 8080, then use label-studio start to open labelstudio on localhost:8080.