President-elect Donald Trump’s team has signed an agreement with the Biden White House unlocking key transition briefings and activities after a lengthy delay that stemmed, in part, from the Trump team’s concerns over a mandatory ethics agreement.

The Trump team is still refusing to accept several typical trappings of the presidential transition process, including federal funding, equipment, office space or security.

President-elect Donald J. Trump’s team will have some formal briefings with outgoing staff members, but it has so far refused to allow the F.B.I. to do security clearances for transition members.