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The first thing is that when updating fields that do not always have values then you need to use the field key. This is covered in the documentation.
I would set the entire group using update_field()
$value = array( // a group field's value is an array // sub field key => value pairs // this is a simple sub field 'field_xxxxx' => 'value', // a nested group would be a nested array 'field_yyyyy' => array( // nested group field 'field_zzzzz' => 'value of field', ) ); update_field('field_ggggg', $value, 'options');
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