ShrfRP

Try the below link, just change the yourdomain.com part to your G Suite domain and point all your clients there for it to prefill the address for you. (From your original post, you'd need to update the link from your school website that staff use) https://accounts.google.com/signin/v2/identifier?passive=1209600&continue=https%3A%2F%2Fgsuite.google.com%2Fdashboard&followup=https%3A%2F%2Fgsuite.google.com%2Fdashboard&flowName=GlifWebSignIn&flowEntry=ServiceLogin&ltmpl=default&hd=yourdomain.com