Make sure, the account details of the PayPal account you have linked are the same as TikTok account details. You cannot link someone else's PayPal account. Also, you should have an active PayPal account for the last six months. Also, make sure you are meeting all the other eligibility requirements laid down by TikTok.  TikTok is an ideal social media platform to earn money for any creator. TikTok Coins is one such method to monetize your content. TikTok Coins is an in-app currency through which users can buy gifts and show their affection towards their favorite creators. Other methods include TikTok Creator MarketPlace, Creator Fund, brand partnerships, etc.