I can’t log into my old Authenticator app that I had scanned a we code with on a old broken phone.

So on my old phone I have a Microsoft Authenticator app for my Roblox account. I never made a username or password I just scanned a QR code and it let me in but I can’t log into that Roblox account anymore to rescan that qr code because I need to have my Authenticator to log into it, and I can’t log into my Authenticator because I never made a username or password to log in to.i tried to log into the Authenticator using my phone number but that just logged me into a personal Microsoft account and it didn’t have the generated Roblox code there either. Is there anyway I can get into that Authenticator without having to rescan the Roblox QR code on my account.