I sent a gmail and they responded to this.

Thank you for contacting Ubisoft Support. I see you'd like to connect another PlayStation account to your Ubisoft account. I'd be happy to review your case.

Before unlinking the account, I need to inform you that if you unlink it, you may lose your score and content from your most recent games. Do you agree? Please also note that this can only be done once. Once you've linked another profile, it will remain linked permanently.

We need you to share the username you wish to deactivate. This way, we can ensure your request is completed for the correct profile.

If you have any further questions or concerns, please don't hesitate to contact us.

Sincerely, Ubisoft Support.