If you don't see the project you don't have access. Google Analytics will tell you who created the link as a good starting point to find who might have access.
Enable Service APIs
Please enable the following APIs. If any of the options are not available you will need to request additional permissions from on the project from your IT team.
BigQuery API (bigquery.googleapis.com)
BigQuery Data Transfer API (bigquerydatatransfer.googleapis.com)
Service Usage API (serviceusage.googleapis.com)
Cloud Resource Manager API (cloudresourcemanager.googleapis.com)
Create Service Account
Create a Service Account Named "GA4addON Product"
A service account is like a user account, but typically used to grant access to an application, in this case GA4addON.
IAM > Service Accounts
Click Create Service Account
Name: GA4addON Product
There is no need to adjust the Service Account ID
Add a description: Service account to run the GA4addON Product.
Click Create and Continue
Add the BigQuery User role
Add the BigQuery Data Editor role
Create a Service Account Key
Select the new service account
Click Actions > Manage Keys
Click Add Key > Create New Key
Select Key type: JSON and click Create
Do not send this via email or anything that saves conversation history. If you need to share with someone, use something like pwpush.com
Upload to GA4addON
Navigate to Project Details from the profile icon at top right
Upload the previously downloaded JSON key file
Save
RECOMMENDED: Delete the JSON key file from your computer
RECOMMENDED: If you need to share, DO NOT EMAIL. Use pwpush.com (or similar).