simple-transaction | Microservices sample architecture for .Net Core Application | Microservice library

I am trying to setup and run this git project - https://github.com/johnph/simple-transaction#WebApi-Endpoints

I have successfully clean up and re-build the whole solution. I have successfully configure to perform EF Core Code-First migration and database was successfully created with 2 tables in it:

• AccountTransaction
• AccountSummary

I could run Transaction.WebApi which opens up http://localhost:60243/swagger/index.html. But, I could not run the other 2 web api projects: Gateway.WebApi or Identity.WebApi. The error occured is This localhost page can’t be found. No webpage was found for the web address:

I could start SimpleBanking.ConsoleApp project. Test data is \src\Services\Identity\Services\UserService.cs. But it returns Object reference not set to an instance of an object. App interrupted. App closed.

I am trying to do Entity Framework Core migration for this project in github - https://github.com/johnph/simple-transaction#WebApi-Endpoints

but hit the above as shown below. I have also set the same project which I do the EF migration as 'startup project'. I tried to search on this error but no avail yet.

I have removed the existing project reference dll, recompiled and re-add the reference. I have also re-install Entity Framework Core and some other Nuget packages. At the end, I can clean and rebuild the whole solution without error.

The only thing I could not get it work is the EF code-first migration which create the database.

At a high level, I would like to set up an action that has some required inputs and some optional ones. After the user begins, he/she will be prompted for any required inputs that are missing. If/when the required inputs are collected, i would like to ask if the user wants to specify more optional inputs.

The specific use case is a voice-based real estate search. I have some required inputs set up like zip code, price, and number of bedrooms. Then I would like bixby to ask "would you like to refine your search even further?" and if the user says yes, we can ask about number of bathrooms, parking arrangements, and other more niche parameters. I do not want to make all of these required and have to prompt everyone if they want to filter by "pools" or some parameter not widely used. And being voice-based, I do not want to just have it as a checkbox on the screen because someone on the speaker won't be able to use that parameter then.

I have thought of 2 potential solutions but I do not know if they will work (at least without relying on the controls on screen for a voice-based capsule):

1) Make the search into a transaction and then instead of a normal confirmation, try to shoe-horn the confirmation to ask if the user wants to add more refinements. Maybe something like the bank transfer one but a negative confirmation would cause bixby to ask for information that she didnt ask for before: https://bixbydevelopers.com/dev/docs/sample-capsules/walkthroughs/simple-transactional#sample-capsule-walkthrough

2) Make 2 more required inputs, one boolean called "WantsOptionalParameters" and the other called "OptionalParameters" that will be a structure containing all of the optional parameters. Then it would prompt for WantsOptionalParameters like a normal required input, and if that is "True", I can have a sub-action that will ask for each one of the parameters to construct an OptionalParameters object. then we could feed that output into the search. And alternatively, if WantsOptionalParameters is false, we can automatically construct OptionalParameters with all negative responses and feed that into the original action.

Both of these solutions will take a bunch more research and testing and i don't even know if they will work, so i was hoping to call on the wisdom of you guys!