This happens if you enabled the two APIs in different projects or if billing is not attached to the active project.
To avoid any further confusion, the best scenario now is to simply shut every project in your GCP account and start from scratch.
To do this:
- Go to your GCP account.
- Select each project from the top-right corner of the screen.
- Click the action button > IAM & Admin > Settings.
- Click the Shut Down button.
Repeat this action with each project in your GCP account until every project is shut down. After this, please see from video tutorials and PDF guide that there are two APIs you must enable.
If you have CitationOptimiser, please follow this PDF guide too. There is another service you must enable on Google API.
(THIS IS ONLY FOR CitationOptimiser Module).
At the end of this procedure, your account should generate leads normally.