Hi guys,
Thank you for reporting this to us, we're sorry to hear that's been occurring.
We'd advise clearing the cache for Ubisoft connect via the steps here.
..and logs show:
Http status code is 409 for url https://public-ubiservices.ubi.com/v3/profiles/sessions.
Login Type: credentials, platform: Uplay.
Failed to login; ServiceUnavailable.
Thanks for clarifying that for us.
To help us look into this from the account side, please get in touch with the Support team through one of the channels below;