Hi,
I'm completely locked out of my Google Cloud project (PII Removed by Staff), which I created using my personal Google Account (PII Removed by Staff). I built this project to authorize Gmail access for my WinUI 3 application using OAuth.

I now receive this message when trying to access the project:

You need additional access to the project...
Missing permissions:

resourcemanager.projects.get
serviceusage.services.list

Trying to use the IAM Troubleshooter results in this error:

You do not have the required permissions to troubleshoot policies on the specified resource or the resource does not exist.

The project no longer shows up in my console — I can't select or manage it anywhere.

I’m not part of any Google Workspace or organization. I’m just an individual developer trying to recover access to something I built. I don’t know what changed.

Troubleshooter URL:
https://console.cloud.google.com/iam-admin/troubleshooter;permissions=resourcemanager.projects.get,serviceusage.services.list;principal=andrey.g.petran@gmail.com;resources=//cloudresourcemanager.googleapis.com/projects/mailnotifierforoauth-346412

Please, help me solve this situation. Thank you.

Best,
Andrey