Just a note: This problem relates to someone I know who is using a trial version of Power Automate
They are using the Power Automate template 'Click a button to email a note'. When they replace the 'User email' with another email belonging to someone other person like so:

The flow fails with the following error:

Here is the error message:
"The Mail connector is currently restricted for new tenants Microsoft is working on enabling this connector. In the meantime, please consider using alternatives like Office 365 Outlook, Gmail, SendGrid connector instead."
I'm not sure why this error message is appearing. Any help would be greatly appreciated.