Register.cs

  [HttpPost("Register")]
        public async Task<IActionResult> Register(RegisterViewModel model)
        {
            var user = new User {UserName = model.UserName};

            var result = await _userManager.CreateAsync(user,model.Password);

            if (result.Succeeded)
            {
                var token = await _jwtService.GenerateAsync(user);

                return Ok(token);
            }

            var errors = string.Join("|", result.Errors.Select(c => c.Description));

            return BadRequest(errors);
        }