Help on Spin Dunks

Hey guys.

I need help on performing spin dunks on my Career. I have an Athletic SF, dunk 90, standing dunk 80, vertical 99 with Posterizer and I have purchased & equipped Two Hand Spin Dunk dunk package.
I should be able to do it then! I have searched everything, tried everything on shootaround and in game but nothing works.
Many people say double tap B (or O for PS3) and he will do it. Others say double tap B and then hit X (or square) and he will do it. Nothing again.

Is there anyone here who can help me?
Thank you and I'm sorry if I am making this topic in the wrong section, I didn't know if there was a more proper one.

This is probably the right forum.

Anyways, there's been a glitch going around saying you can't dunk in Shoot-Around most of the time.
I've had a 6"0' PG that is 3PT Shooting that I trained to have 80 Dunk.

I never dunked in SHOOTAROUND. Never in my life, Attempted it for like 15 minutes.

There probably IS a glitch in S.A. and if you need any help, here's what you gotta do.
Try going to the Advanced Controls section in the settings. It should probably say how to do SD's there.

Now, try doing it with LeBron or Wade in exhebition.
Didn't do it?

If you didn't do it, here's a big tip.
This dunk works most of the time when there is contact, like a person standing in front of you.
Double tap B/O in front of a person to engage the dunk package.

Multiple attempts and still haven't done it?
Be sure to make it your SIGNATURE DUNK.

Reply to this post if nothing actually works, I'll try looking into it.

I have it in my signature dunk, it's number 1. Of course I have added more in the remaining spots, like windmill dunks for instance.
Still haven't done it in a game (the spin dunk) but I will try again...
Thanks for your help!

I went for some practice with Derozan and it is really simple to spin dunk with him...
It makes no sense at all. I even made the two hand spin dunk my only dunk package and it still failed.
I don't know what else to do.

I went for some practice with Derozan and it is really simple to spin dunk with him...
It makes no sense at all. I even made the two hand spin dunk my only dunk package and it still failed.
I don't know what else to do.

Try playing Scrimmage.

Now try going with a screen and sprint to the rim. And then try Double tapping B/O then see if you'll spin.
If spin layups work, it'll work. It's pretty much a one in a hundred chance you'll spin dunk in MyCareer.

Just try to play MyCareer and attempt Spin Dunks if you know you can make them.
Another tip;
Be sure to be outside of the paint the moment you attempt spin dunking.

For example, you're going to the side of the rim (near the baseline) then probably two steps away from the baseline is where you attempt the spin dunk.
I don't think it'll work if you're going to the actual front of the rim, and most of the time about 1/10 chance it will work without anyone in front of you.

Try taking a look in my 'Champions' montage, or maybe the 'My Time' montage in my YouTube channel.