Based on the doc: https://docs.google.com/document/d/1d5alzMVxU6vfZaxcvVrJGr-G3_z4rHbCPkskfGtj1lw/edit?tab=t.0#heading=h.ll06elsrif5g

Category: Authentication (1).

Currently we have implemented tests for log in to different regions: https://issues.redhat.com/browse/OSPRH-18899 and switching regions: https://issues.redhat.com/browse/OSPRH-18898 

We should modify those tests to add there also checking of resources. And also negative checking.
The best way is probably to create using some of the simple resources (flavor, keypair) using OpenStackSDK, different for every individual Region and then as a part of the previous tests when we switch between the Regions, we should check if we can see only the resources that align to the specific Region.