To delete files from GSuite backup I'm asked to sign in with Alternate Email
Utilizing an alternate password for data deletion adds an extra layer of security. To verify your alternate email address, a verification email should have been sent to the email address you provided. If you haven't received the verification email, please follow these steps to activate the email service in your provider account. Log in to https://console.msp360.com, navigate to 'Settings,' select 'Email Service,' and then follow the on-screen instructions. After that, you can re-add your alternate email address to verify it.