This is 'Umrah that we have benefited from. Whoever does not have a Hadi with him, let him exit Ihram completely. Now 'Umrah is permissible during the months of Hajj." (Using translation from Nasāʾī 2815)
عَنِ النَّبِيِّ ﷺ قَالَ هَذِهِ عُمْرَةٌ اسْتَمْتَعْنَا بِهَا فَمَنْ لَمْ يَكُنْ عِنْدَهُ هَدْيٌ فَلْيَحِلَّ الْحِلَّ كُلَّهُ فَقَدْ دَخَلَتِ الْعُمْرَةُ فِي الْحَجِّ إِلَى يَوْمِ الْقِيَامَةِ