Set up a Microsoft Alias
You can set up an alias in just about any Microsoft account to send using another email address you own. If you aren't able to follow the steps below, you may need to contact your team's mail account admin to see if they block the ability for you to use an Alias.
What do I need to set this up? You'll need to make sure you're able to access both the Gmail/Google Workspaces email account and your alias email account in addition to your Mailshake account to complete setup.