Hey! While it looks like you may have already heard back from our Support Team on this one, I'm happy to recap what might be going on here.
To start, the passcode your referencing is most likely tied to our Employee Management features. This article does a good job of explaining them in more detail:
https://squareup.com/help/us/en/article/3937-manage-passcode-access
In a nutshell, you can always assign a new passcode to an "Employee" or "Owner" (yourself) from the dashboard if you've lost track it (it happens, trust me).
As for the second half of your question, it sounds like you might be talking about Device Codes. A device code allows you to log into any supported device and pair it to a business location. It’s an easy, secure alternative to logging in with your email address and password. You can check out more details on Device Codes here:
https://squareup.com/help/us/en/article/5586-manage-devices-by-location
Hope this helps!
Sean
he/him/his
Product Manager | Square, Inc.
