I have got exactly the same error and the support team also sent me here. Below is whats written (in norwegian and translated to english) on the support site. How do I get verified whether I have multiple adobe IDs or not?
More Adobe IDs
Always use the same Adobe ID (email address) when purchasing a new membership, plan, product, subscription, or service from Adobe.
If you think you have multiple Adobe IDs associated with different email addresses, or are unsure of which affiliate or product you purchased, contact us.