Maniaplanet Forum

Hello, I already own Valley and Lagoon, and I've purchased Stadium today.
I bought it via the Nexway Maniaplanet site, and since I didn't remember my account's login for this specific website, I registered as a new customer...
I recieved the mail containing the activation key, but I've tried registering it on both Maniaplanet and my Player page, it always says "Key not associated with account, key unknown" or "Invalid key"!

What do I do now? I've tried contacting Nexway via their customer service thingy, without an answer. Not even sure it sent correctly.

A nexway account has nothing to do with a Maniaplanet account.
As long as you have received a valid key, this should work in Maniaplanet.
Perhaps you have to try again next week.

Otherwise wait for the support from Nexway.
And if they cannot resolve the issue, then please contact the Ubisoft support.

I've tried activating my key in UPlay, and it worked here, but here only. But it's making me download Maniaplanet again! Which I DEFINITELY cannot allow myself to do with my connection.
How can I launch it in the Maniaplanet I already have?! This is a nightmare.

You cannot. This is a known limitation of the game platforms.
A key purchased via Uplay needs to be activated by Uplay.
A key purchased via Steam needs to be activated by Steam.

Luckily the Maniaplanet base system is only 100MB download and this should be sufficient for the activation of the key to the account.