How do I invite a friend to microsoft rewards without knowing their email

Hello there!

Regarding your question I recommend that you try contacting the rewards team. We have a dedicated team for such questions and they will be able to assist you the best they can Microsoft Rewards | Xbox.

Update: I don't know why, I don't know how, but for some bizzare reason that I couldn't WISH to explain I somehow logged into the Minecraft launcher with my microsoft account WITHOUT KNOWING ANY CREDENTIALS AT ALL!!!

I DON'T KNOW HOW THIS HAPPENED

I now have access to my Minecraft (NOT Microsoft) account without knowing the email or the password.
What do I do now???

I dont know an exact fix for the cant join party issue, but one thing Ive learned to do is create a party and set the invites to public so that way my friends can just hop in without an invite.

How do I invite my three friends?

You can invite your friends
here under Friend Invites.

playfire send the invites under your friends gamertag to make it look like your friends sent it you, i dunno how playfire does it tho. A while ago maybe a few years playfire got into hot water for asking for your wlid and password. They state they dont store
your email and password but they do. Ive had invites from them in the past and odd thing is my mates have never signed up nor me so how they got my gamertag i dont know. Stick with reputable websites like xbox360achievements.org.