Apologies as I dont have alot of development experience with android
No worries 
I myself have been learning along the way recently.
I consulted the “Set the application ID” document from Android and it explains that:
"And although the application ID looks like a traditional Java package name, the naming rules for the application ID are a bit more restrictive:
It must have at least two segments (one or more dots).
Each segment must start with a letter.
All characters must be alphanumeric or an underscore [a-zA-Z0-9_]."
I think the infinite loop you were getting is related perhaps to a mismatch between the registered callback URL with Auth0 and the values in the app configuration. I’ll research more with Amin and other colleagues on what are the implications of changing the applicationId in relation to Auth0.
I opened the new project with Android Studio and it was just very laggy in loading the files.
Android Studio do be like that sometimes! I have started using Visual Studio Code more often because of that.
Are you able to share what might be shared next in terms of flutter documentation (if any).
What do you mean by this exactly? 
Do you mean our future tutorials on Flutter?