Administration officials say about 476,000 health insurance applications have been filed through federal and state exchanges, the most detailed measure yet of the problem-plagued rollout of President Barack Obama‘s signature legislation.

However, the officials continue to refuse to say how many people have actually enrolled in the insurance markets. Without enrollment figures, it’s unclear whether the program is on track to reach the 7 million people projecting by the Congressional Budget Office to gain coverage during the six-month sign-up period.

Obama’s advisers say the president has been frustrated by the flawed rollout. During one of his daily health care briefings last week, he told advisers assembled in the Oval Office that the administration had to own up to the fact that there were no excuses for not having the website ready to operate as promised.

The president is expected to address the problems on Monday during a health care event at the White House. Cabinet members and other top administration officials will also be traveling around the country in the coming weeks to encourage sign-ups in areas with the highest population of uninsured people.

The first three weeks of sign-ups have been marred by a cascade of computer problems, which the administration says it is working around the clock to correct. The rough rollout has been a glaring embarrassment for Obama, who invested significant time and political capital in getting the law passed during his first term.