You're right, apologies.
Here's the rules thread:
viewtopic.php?f=657&t=43283Friends &
Schools are ignored,
rank and
norank are considered. The rules:
Becoming an Ambassador
In order to determine if a Diplomat should become an Ambassador, at the end of each game player records are checked to see if any Diplomats have attained Ambassador status.
• Your last three finished games you played from the start are examined, together with any other intervening activity such as other active games or surrendered pickups
• If you had NO SURRENDERS and no more than 3% NMR rate (excluding Builds), you become an Ambassador
You last 3 games are ( you don't have any where you've taken over positions, these are all ones you started in):
126197. Gunboat AofE
125661. Killer Queeeeen
125283. >NEW YEAR game
Your current games are also considered:
125989. JFF
You've not surrendered in any of these. I'm going to guess your NMR rate in those games is >3%. (Although this is looking pretty unlikely to me.)