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It’ll be writing a settings file like

{
“network_name”:”MatthewNetwork”,

”network_password”:”SecretPassword”
}

..and because the beginning or end of my password is a double quote it’s getting confused with where the value starts and ends.. usually you escape special characters like with a \ so it knows to treat it as a special character rather than a start or end quote.. and when the double quotes are in the middle of the password this works fine but the code that does the replacing must be not checking the first or end characters to add escape characters to and so it’s corrupting the config file instead. Could be something like an off by one error - https://en.wikipedia.org/wiki/Off-by-one_error

Obviously I have no access to the Sonos code.. just know the behaviour (I tried reducing my password and swapping out characters until it worked and then worked out what caused it to break). It’ll be something to do with double quotes being the delineation of a start and end value however and it not escaping it correctly.

That is such an amateur coding error. Makes you go hmmmm.