Perhaps you missed the last bit.

In recent months, Iran accelerated its nuclear activities such as enriching uranium up to 60% purity and installed new, advanced centrifuges the use of which were prohibited under the 2015 nuclear deal. With the coming of the Biden administration, Iran and the remaining parties to the JCPOA embarked on new negotiations on how to revive the deal."
The US is quite happy continuing with the negotiations.

The US says it has carried out air strikes against Iran-backed militias near the Iraq-Syria border in response to drone attacks on its forces in Iraq.

A Pentagon spokesman said the strikes targeted "operational and weapons storage facilities" at three locations.

US strikes in Iraq and Syria target Iran-backed militia facilities - BBC News