The delegation suggested to the Uzbek government that Afghan deportation candidates should be brought to Tashkent. From there they could be transported to Kabul.
The UN expert said Corbett has developed several medical problems, including ringing in his ears, and severe weight loss.
Friday's attack was among the most serious targeting foreign citizens since foreign forces left and the Taliban took over in 2021.
Thousands of homes were damaged, and livestock wiped out, the Taliban-run refugee ministry said.
Islamic State claimed responsibility for the attack in the provincial capital Faizabad, the group's Telegram channel said on Wednesday.
Islamabad says Kabul is not doing enough to tackle terrorist groups targeting Pakistan and in March Pakistan carried out airstrikes targeting terrorists on Afghan territory.
Since they swept back into power, most girls have been barred from high school and women from universities.
The Taliban has suspended girls' education past the sixth grade and banned women from public spaces such as parks, gyms, and bathhouses.
"We need to resolve pressing issues, this also requires dialog, so in this regard we communicate with them like practically everyone else - they are the de facto authority in Afghanistan."
A weekly selection of opinions and analyses from the Arab media around the world.