Additional question on top of previous: And is there a possibility to continue with the secondary e-mail adress in case you no longer have access to the primary (free or paid)?
For the additional question : In case you do not have the access to the Primary email address and you have a Creative Cloud Teams Account, your Team Contract Owner can remove the license from the Primary email address and re-assign the Subscription to your Secondary email address.
In case you have an Individual Subscription registered to your Primary email address, than you may need to Cancel the Individual Subscription and place a new Order using your Secondary email address for which you have access.
Hope it helps.
Thank you.