Here's a quick review of the road so far:
CI CD in Azure Synapse Analytics Part 1
Creating an Azure DevOps project
Linking our Azure Synapse Analytics environment to that Project via Git ...
In the Azure Portal if you go to Azure Active Directory | Under Manage go to App registrations | then
IF you were the one to create the DevOps Project that contains the repo:
you can click on Owned applications and it should list all of the Service Principals that you own. All of my DevOps projects Service Principals are there. You should be able to find the project name in part of the Service Principal name.
IF you were NOT the one to create the DevOps Project and you have the permissions required to list the App registrations screen you can search on that page for the project name, if you do not have permissions to access AAD then you may need to team with someone in your organization who does.
Quick example: I presented at the Fall DevIntersections / SQL Server & Azure SQL Conference in Las Vegas. I taught a post con on DevOps where I created a project named FallIntersectionsPostCon2021. When I type in FallIntersections (and keep in mind this is case sensitive so you want to match the case) I get two services that match. One I was testing my content on that happened to have a similar name, and the other Service Prinicpal for my account.