Question:

Is it then impermissible to fast during the days of tashreeq?
Answer:

The Lajnah stated:

“… The Days of Tashriq are intended for eating and drinking, and it is not permissible to fast during these days except for the people who were unable to offer Hady during Hajj. (This is the case) as it is allowable for them to fast these three days in particular. And after returning home, they should fast seven days in addition.

[Reference]

Answered by

AbdulFattaah bin Uthman
Abu Fajr