searching an External user in People picker and starting an invitation

yasi67 

Hi,

i think they are just checking if the email address entered matches a given pattern and if the domain is not yours. They are not actually searching for the address. (As you can enter every mail adress even if it does not exist)

You can code this in javascript like this:

const address="email address removed for privacy reasons"
if (!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i.test(address)) {
    console.log(`${address} is a valid mail address`)
}

Then you can use the "Invivations" Endpoint of Microsoft Graph to send the actual invitation

https://learn.microsoft.com/en-us/graph/api/invitation-post?view=graph-rest-1.0&tabs=http

POST https://graph.microsoft.com/v1.0/invitations
Content-type: application/json

{
  "invitedUserEmailAddress": "email address removed for privacy reasons",
  "inviteRedirectUrl": "https://myapp.contoso.com"
}

Best Regards,

Sven