Connecting a data source usually has two parts.
Authorize the platform account.
Link the specific account, property, or profile to the right client.
Basic steps:
Open Integrations or the client’s Integrations area.
Choose the platform you want to connect.
Follow the authorization flow.
Select the account or profile that belongs to the client.
Save the connection.
Test the connection before building widgets.
Use the account that has access to the client’s marketing data. If the wrong login is used, the account you need may not appear.