EA and DICE have said that the Xbox 360 version of the Medal of Honor multiplayer beta won't start until next week.
The PC and PS3 versions begin on 21st June, although people who own Battlefield: Bad Company 2 and have pre-ordered MOH can start playing today.
Xbox 360, however, faces a delay - the length of which hasn't been discussed.
"We are extremely disappointed about this, but want to assure you that we are dedicated and determined to delivering all of you this awesome multiplayer experience as soon as possible," the companies wrote on the game's official site.
On the plus side, they've said that the beta will be extended to make up for the lost time.
The multiplayer aspect of Medal of Honor is being developed by DICE, while the single-player has been put together by EA Los Angeles. You can read more about that in our Medal of Honor single-player preview.
Earlier this week Sony and EA announced that the PS3 version of the game would include an HD remastering of Medal of Honor: Frontline, which came out on PS2 millions of years ago.