The young midfielder, better known as Izzy, was an unused substitute in Saturday's 1-0 top-flight defeat at Chelsea.
"The experience was amazing," said Brown to the WBA website. "The boys helped me fit in well and it was great going to a stadium like Stamford Bridge.
"I found out first from Twitter I was travelling. It happened so quickly and Steve Clarke grabbed me and told me I was involved - and I have to thank him for giving me this experience.
"My mum was over the moon, she shed a few tears, and my friends have just been buzzing about it. I did get a few butterflies when I saw my shirt hanging up - it's something special.
"Getting a first-team shirt and squad number is what every boy dreams of.
"When I warmed up the fans sang a little song, it was a good reaction - and I wasn't expecting it at all."