If you cannot use the selected sound on TikTok, it is often because your TikTok account is a business account. However, you can easily switch back to a personal account in the settings under “Settings > Account > Switch to personal account”. 
If you cannot use the selected sound on TikTok, it is often because your TikTok account is a business account. However, you can easily switch back to a personal account in the settings under “Settings > Account > Switch to personal account”.