Hi,
I am facing the same issue both on iPhone and iPad. It started with version 17.7 and briefly worked after upgrading to 18.0.1, but again I cannot access any workspaces. Now I cannot access the Databricks workspace for managing the workflows while I am traveling for work, because carrying a big PC with me is not an option.

So far, the MS Support (we use Azure DBX) reply was that it is not supported on mobile browsers and should be used on either Windows or MacOS. I am really very happy 😞