What happens if I send email invites out for two token grants with the same email address?

If you use the invite all button, the stakeholder will receive one email invite notice that will register their wallet address to all draft token grants.

If you use the invite button for each token grant, the stakeholder will receive one email every time you press invite. They can click either email's Activate account button and register the wallet address to all draft token grants for the stakeholder.