How to allow Cookies for Adobe Sign for Outlook?

Hello,

when I try to sign a document via the Adobe Sign Outlook Plugin an Outlook-in-app-browser-window opens saying cookies are necessary for the plugin to work and it is asking for permission to activate cookies. But becaus it is an Outlook-in-app-browser-window, I did not find any option to change the cookie-options. In the Standard-browser cookies and tracking is activated. But it sees that this has no effect on outlooks own browser-windows.

How can I  allow Cookies for Adobe Sign for Outlook?

I'm am on a Mac.