Technical Can't Q for heroic dungeons

[ormand42]

I meat all the requirements for the heroic dungeons but it is greyed out and can't play.

[Thorbjorn]

Then you clearly don't meet all the requirements?
Your average item level is too low.

[Keymouse8800]

I meat all the requirements for the heroic dungeons but it is greyed out and can't play.

You need an average Ilevel of 187 across all your slots to be able to queue. The game will let you queue when you meet the requirements.