Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

ApplicationLayer/Services/AuthServices/RegisterService/RegisterService.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.Applicants.NeededServices;
+using ApplicationLayer.Services.AuthServices.NeededServices;
+using ApplicationLayer.Services.AuthServices.Requests;
+using AutoMapper;
+using Domains.ApplicantDomain;
+using Domains.Users;
+
+namespace ApplicationLayer.Services.AuthServices.RegisterService;
+
+/// <inheritdoc cref="IRegisterService"/>
+public class RegisterService(
+    IUsersRepository users,
+    IApplicantsRepository applicants,
+    IUnitOfWork unitOfWork,
+    IMapper mapper) : IRegisterService
+{
+    async Task IRegisterService.RegisterApplicant(RegisterApplicantRequest request, CancellationToken cancellationToken)
+    {
+        var user = mapper.Map<User>(request.RegisterRequest.AuthData);
+        user.Role = Role.Applicant;
+
+        var applicant = mapper.Map<Applicant>(request);
+        applicant.UserId = user.Id;
+
+        await users.AddAsync(user, cancellationToken);
+        await applicants.AddAsync(applicant, cancellationToken);
+
+        await unitOfWork.SaveAsync(cancellationToken);
+    }
+
+    async Task IRegisterService.RegisterAuthority(RegisterRequest request, CancellationToken cancellationToken)
+    {
+        var user = mapper.Map<User>(request.AuthData);
+        user.Role = Role.ApprovingAuthority;
+
+        await users.AddAsync(user, cancellationToken);
+
+        await unitOfWork.SaveAsync(cancellationToken);
+    }
+}