I have a question regarding Gen AI content submission in Adobe Stock , can I generate image using adobe firefly and submit it to adobe stock

The short answer yes. 
A few suggestions: 
1) pop your image into Adobe stock search engine and see how many images pop up using the keywords you plan to use
2) Artistic images are definitely hit and miss. Ask yourself who is your target audience. 
3) AI content needs a bit more care and attention. Make sure to look very closely for artifacts and issues in the image.

Cheer
Nate

They can be generated anywhere. Be careful, I usually spend an hour or more on the image in Photoshop, fixing all the problems that I catch. I always count fingers on every hand.

Images generated with Firefly can also be registered with Adobe Stock.