Adobe Portfolio Domain Connection (A Records)

I am trying to link a domain that is currently with the German provider strato.de to my Adobe Portfolio website.

Portfolio wants you to put in four (4) A-records. However strato.de will only allow me to put one (1). How does that make any sense?? Screenshots can be found below that illustrate the issue.

I’ve already contacted strato.de and they told me to check with Adobe on how to connect the domain. 

I’ve also tried to send a message to the Portfolio support but it won't submit the request unless I confirm my email. But I’ve submitted it twice at this point and have not received an email to confirm.

It all seems very cursed.
 

How do I get this to work? And how is it possible that there is such a discrepancy between services. You would assume connecting domains should be a straightforward process worldwide.

But I dont understand much about webdesign and domains.

Any help would be appreciated.