Soco works with Personal (Creator) TikTok accounts only. If your account is set to Business, switch it before Soco can work. TikTok no longer uses the label "Creator account": it's now called a Personal account, and the two mean the same thing.
Switch from Business to Personal
The switch happens inside TikTok's own settings:
Open the TikTok app.
Tap Profile at the bottom.
Tap the three-line Menu button at the top.
Tap Settings and privacy.
Tap Account.
Tap Switch to Personal Account and confirm the change.
Switch from Personal to Business
The path back is the same menu:
Open the TikTok app.
Tap Profile at the bottom.
Tap the three-line Menu button at the top.
Tap Settings and privacy.
Tap Account.
Tap Switch to Business Account, select your business category, and confirm the change.
Before you switch
Three things worth knowing first:
Soco doesn't work with Business accounts, so you need a Personal (Creator) account to use Soco.
Switching account types doesn't delete your TikTok content or followers.
TikTok advises against switching back and forth between account types frequently.
Next steps
Once your account type is right: