This is related to the expiration of the 3-month monitoring deal between Iran and the United Nation's nuclear monitoring agency.
Talks continue in Vienna, this will be a hiccup.
Comments from Iran’s parliament speaker, Mohammad Bagher Qalibaf on state TV. ’s “Regarding this, and based on the expiration of the three-month deadline, definitely the International Atomic Energy Agency will not have the right to access images from May 22”
Referring to surveillance camera images
Info via Guardian, link for more.