A method for a playback device, the method comprising: maintaining data indicating: a first user account for a service provider; and a first priority indicator corresponding to the first user account; receiving data indicating a second user account for the service provider; determining a second priority indicator corresponding to the second user account based on the received data indicating the second user account for the service provider; and causing to be stored, data indicating: the second user account for the service provider and the second priority indicator corresponding to the second user account, receiving an instruction to play media content from the service provider via the playback device; identifying, based on at least the first priority indicator and the second priority indicator, one of the first and second user accounts as the account to be used to access the media content from the service provider; obtaining the media content from the service provider using the identified account; and playing the media content via the playback device; wherein the second priority indicator comprises at least one of: a time stamp corresponding to a time when the data indicating the second user account was received; and an incremental numeric value based on a number of user accounts previously registered with a media playback system that comprises the playback device. maintaining data indicating: a first user account for a service provider; and a first priority indicator corresponding to the first user account; a first user account for a service provider; and a first priority indicator corresponding to the first user account; receiving data indicating a second user account for the service provider; determining a second priority indicator corresponding to the second user account based on the received data indicating the second user account for the service provider; and causing to be stored, data indicating: the second user account for the service provider and the second priority indicator corresponding to the second user account, the second user account for the service provider and the second priority indicator corresponding to the second user account, receiving an instruction to play media content from the service provider via the playback device; identifying, based on at least the first priority indicator and the second priority indicator, one of the first and second user accounts as the account to be used to access the media content from the service provider; obtaining the media content from the service provider using the identified account; and playing the media content via the playback device; wherein the second priority indicator comprises at least one of: a time stamp corresponding to a time when the data indicating the second user account was received; and an incremental numeric value based on a number of user accounts previously registered with a media playback system that comprises the playback device. a time stamp corresponding to a time when the data indicating the second user account was received; and an incremental numeric value based on a number of user accounts previously registered with a media playback system that comprises the playback device.