Where are archived Dynamic Links?
If you want to EDIT a Dynamic Link that has been archived, consider this:
You need to know the Dynamic Link in question
Using Firebase Console, click to edit some other (non archived) Dynamic Link.
Note the shortened URL itself, and see how it is represented in the address in the browser address bar, specifically the end of the URL
Simply replace the non-archived shortened URL at end of the URL, with that of the ARCHIVED shortened URL, and load it (hit enter).
Result: You will be presented with the edit screen for that archived dynamic URL. This worked for me today: 10/25/2019