Google Cloud – Unable to Create New Projects on a New Account: Solutions

NOTE: This answer is anecdotal, but still probably relevant.

I encountered a similar issue a little over a year ago. It turns out there's a bug somewhere in Google's systems: if you are a member of any Google Groups, other members' projects show up in your project listings. Since you don't actually get any access permissions to those projects, Google did not consider it a security issue when I reported it and decided no action was necessary.

You can check which groups you're subscribed to here: https://groups.google.com/my-groups; and leaving them should automatically remove the projects from your project listings.

Originally posted as a comment.

You're not able to create a new project because of lack of permissions.

Please have a look at the documentation Creating a project:

To create a project, you must have the resourcemanager.projects.create permission. This permission is included in the Project Creator roles/resourcemanager.projectCreator role, which is granted by default to the entire domain of a new organization and to free trial users. For information on how to grant individuals the role and limit organization-wide access, see the Managing Default Organization Roles page.

To solve this issue add this role at the Organization level.

Unfortunately, you won't be able to send email directly from your VM.

Please have a look on the documentation Sending email from an instance:

Due to the risk of abuse, connections to destination TCP Port 25 are always blocked when the destination is external to your VPC network. This includes using SMTP relay with Google Workspace.

As a result, port 25, which is used by Simple Mail Transfer Protocol, is blocked:

Most mailbox providers still allow submission on traditional port 25. The MSA delivers the mail to its mail transfer agent (mail transfer agent, MTA).

As a workaround, to send emails you should follow the documentation and use email relays like SendGrid, Mailgun or Mailjet or your Google Workspace domain.