Thank you very much for the link. At least now I know the code was sent
somewhere in my account.
Are you referring to the Beedrillite and Mawilite Mega Stones?
According to The Pokemon Company, no:
"
Thank you for contacting Pokémon Support. Prizes for this event have not yet been awarded or posted. They will be posted on the PGL site once available. The link you're referring on the PGL site on 3/7/17 were the rankings and final scores for this competition. Prizes have not yet been awarded. Please continue to watch the site for updates. We will be closing this ticket at this time."
But according to tens of thousands of people who received the codes via their Pokemon Global Link accounts, Tuesday, March 7th. There must be one guy sitting at a computer somewhere who runs the Global Link website himself, and doesn't communicate at all with The Pokemon Company.