powerapps send email from other account
Office365Outlook.SendEmailV2(toEmail, subject, body, {From: fromEmail});
This parameter allows you to send Email on behalf of the others within
your Office 365 tenant.
Doing it in this way requires Mailbox permission from the other User Account.
To give permission >> https://docs.microsoft.com/pt-pt/microsoft-365/admin/add-users/give-mailbox-permissions-to-another-user?redirectSourcePath=%252fen-us%252farticle%252fgive-mailbox-permissions-to-another-user-in-office-365-admin-help-1dbcf12f-a9de-4d1d-b0b3-a227f8a736d8&view=o365-worldwide