Hallo,
I wanted to switch from Prestashop version 1.6.1.15 to 1.7.2.0. In version 1.6.1.15 there was no problem with the admin area.
The Server is running in docker on port 8080:80.
Trying fresh install 1.6.1.15, going to http://localhost:8080/admin, works.
Trying fresh install 1.7.2.0,...