Unable to remove myself from an unknown Google Cloud project named “partnerstack”

My Google account is a personal account, and I do not belong to any organization.

There is an unknown project named " partnerstack " in my Google Cloud account, and I am unable to delete it.

project number : (PII Removed by Staff)

project ID: (PII Removed by Staff)

When I try to shut down the project, I get an error saying that I do not have the resourcemanager.projects.delete permission.
(Image Removed by Staff)
I do not necessarily need to delete the project itself, but I would like to remove myself from the project.

When I check the project settings, it appears to belong to organization (PII Removed by Staff). However, I do not recognize this organization and do not believe that I belong to it.

For organization (PII Removed by Staff), I can only see the numeric ID. I cannot see the organization name at all.

In short, I would like to know how to leave this organization (PII Removed by Staff) and remove the partnerstack project from my Google Cloud account.

When I check IAM, there are 35 accounts listed, and about half of them appear to be human user accounts.

My own email address is not listed in IAM.

The email domains shown in IAM include the following:

chromium.org
grit.org
partnerplaybooks.com
successhype.com
ienterprises.com
windsor.ai
googlegroups.com
gmail.com

My email address is a normal @gmail.com address.

I am not aware of having done anything special that would cause this.

I do not remember when this project first appeared. I noticed it while trying to create a list of my Firebase and Google Cloud projects.