They did. IAEA repeatedly certified that they were complying with the deal.
The IAEA's inability to address Israeli + Republican "concerns" about uranium hiding at military sites is not an indication that Iran reneged on the deal, it's an indication that Israel and Republicans never really wanted a deal and would criticize any deal for not going "just a bit further." In this case, "just a bit further" meant "surprise access to any Iranian military site" which is a wild thing to ask for and an indication of just how far the deal already went.
The IAEA's inability to address Israeli + Republican "concerns" about uranium hiding at military sites is not an indication that Iran reneged on the deal, it's an indication that Israel and Republicans never really wanted a deal and would criticize any deal for not going "just a bit further." In this case, "just a bit further" meant "surprise access to any Iranian military site" which is a wild thing to ask for and an indication of just how far the deal already went.