Apparently, there is part of the Constitution that allows the President to call an adjournment when the House and Senate are in disagreement re: recess.

If House wants, but Senate doesn't, the President can decide.

If Senate wants, but House doesn't, again, the President can decide.

Article:

The House can influence the recess appointment process. The House Speaker may propose a concurrent resolution for both chambers to adjourn, effectively facilitating the conditions needed for a recess appointment.

Alternatively, if the House and the Senate are unable to agree on adjournment, the President might use this disagreement to adjourn both, enabling the use of recess appointments, according to CNN.