There is some function, through that you can resolve the compilation error that you get for codeunit 6400 Flow Template Selector when converting a Microsoft Dynamics NAV 2018 database to Business Central.
Add the following functions:
PROCEDURE GetAzureADGraphhResourceUrl@4() : Text;
PROCEDURE GetMicrosoftGraphhResourceUrl@31() : Text;
When you convert a Microsoft Dynamics NAV 2018 database to a Business Central version, you will receive compilation errors in several standard Dynamics NAV objects.
System code units do not contain code. They only contain event publishers. Instead of running codeunit and calling respective functions, Business Central Server runs system code units. The system codeunits will, in turn, raise published events.