I know Esri in their infinite wisdom wants to move as far away from concurrent licensing as possible, but for many of us this is still a reality that has to be managed. Let's not make our management more difficult by inciting a riot among the users.
ArcGIS Desktop did not handle FlexLM errors elegantly, but at least they passed the License Manager error to the end-user. "Checkout exceeds MAX specified in options file", "User/host not on INCLUDE list for feature", and "Licensed number of users already reached" and others can be frequently seen at ArcGIS Desktop initialization.
ArcGIS Pro's handling of these errors is abysmal. License Server can't be reached, MAX checkout exceeded, etc; all have Pro launch to the licensing options window without the benefit of the end user knowing why. To which they either re-enter the correct parameters over and over until they are frustrated beyond all belief, or worse they go down the rabbit hole of changing everything they can change over and over until they are frustrated beyond all belief.
Please introduce a pop-up that informs the user why Pro can't obtain a license and provide them the option to "Modify License Configuration?" or to exit altogether. It would be great if there were to be an option to "Contact your license Administrator" with information populated from a reg_key at install.
Thanks for listening & here is to hoping!