In order to connect your ad account to Funnel, the credentials you are connecting with need to have access to that ad account. You can either connect using the credentials of the owner of the ad account, or by another user with access, as described below:
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Log in to your TikTok Business Account on Tiktok Business Center.

Under the Users tab you can invite an email adress:

Click next, then on the next page you can see a list of advertiser accounts, and grant this email user the necessary Analyst access to the advertiser account you want access to.
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You should now be able to connect a data source in Funnel using the credentials of this email.
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If this email user was already invited to the business account previously, you can go to Accounts and click on the ad account. From here you will be able to assign new members to this ad account and select Analyst access.

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