public async Task CreateAsync()

in app/Data/AppUserStore.cs [20:35]


        public async Task<IdentityResult> CreateAsync(AppUser user, CancellationToken cancellationToken)
        {
            cancellationToken.ThrowIfCancellationRequested();
            if (user == null) throw new ArgumentNullException(nameof(user));

            try
            {
                _context.Add(user);
                await _context.SaveChangesAsync();
                return IdentityResult.Success;
            }
            catch(Exception ex)
            {
                return IdentityResult.Failed(new IdentityError { Description = $"Could not insert user {ex.Message}." });
            }
        }