The $option_group parameter of register_setting should match the $option_group parameter of settings_fields, which is typically used as part of creating a custom settings page.
When you use register settings with register_setting(), your registered settings are added to a global variable of allowed options, where they are grouped by the $option_group parameter. When you submit your settings page WordPress only updates the options for $_POST fields that match options found in the list of allowed options for the current group. The current group is determined by a hidden field that’s added by the settings_fields() function.
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