Need help with TikTok ad

I’d like to boost our reels on tiktok. I already boost posts on instagram but don’t under how tiktok ad works.

I went to our tiktok and “tried” to boost a reel and added money in my apple account which was through my meezan card.

The money was deducted but then tiktok said that the ad has been declined.

Boosting the same reel on Instagram has never given me problems.

What could be the reason?