Closing the thread because this discussion is turning circular and is veering off of the original support request.
As others have said, it is (at least) breaching the rules on handling PII and it is unwise to request and save credentials from users in this situation, since you don’t actually need this – they already have their Roblox account and you can identify users by their ID. Asking for a username + password purely for the sake of simulating the login screen of an existing game is probably not a good idea. Keep in mind that you are dealing with a relatively young audience who are likely to make the mistake of filling out their actual account details.
Please also make sure that you follow the guidelines for Scripting Support in the future as can be read here: