Why did connecting to TikTok for Business fail?

There are 3 reasons:
a. User connected to the TikTok for Business account which is connected by another user, please connect to another account.

b. User who already has an ad account on Ecomdy Platform, your ad account does not exist with the Tiktok for Business account you just connected to.

c. Please agree to access all permissions related to your TikTok ad account to connect successfully