Are you by chance located in Colombia? If so, the most likely issue is that your internet service provider (isp) is BLOCKING. You might be able to use the server at code.appinventor.mit.edu
This is explained in the posts below. Does this help?
This website cannot be accessed (ERR_CONNECTION_RESET)
MIT App Inventor Help
colombiablocked
2d - this the problem in Colombia image
No funciona app inventor
MIT App Inventor Help
bug-or-problem
Jan 18 - soy de colombia y estoy tratando de entrar a crear aplicaciones pero no me deja entrar ya quite cookies y todo o qu…
Mit ai2 companion not working
General Discussion
bug-or-problem
Jan 21 - …od for virtually everyone so you need to do some detective work. Here is a link where some users in Colombia are having issues with the AI2 Web page I can´t access “Create apps” button Are you in Colombia? If…
I can´t access “Create apps” button
MIT App Inventor Help
Jan 16 - …ge”. I’ve tried accesing from 3 differents pc’s and the same error occurs. I’m writing from Bogota, Colombia. Does anyone have the same problem? Thank you for your time. image
No ingresa a plataforma de App Inventor 2
MIT App Inventor Help
Dec '19 - hi, im cesar form colombia, The main page ( https://appinventor.mit.edu/ ) Inventor server is working ok, but by clicking in “…