No route matches supplied values but values seem to match?

System.InvalidOperationException: No route matches the supplied values.

            var response = new UserResponse(
                user.Id,
                user.ProductId,
                user.Username,
                user.Role,
                user.CreatedOnUtc);

            var actionName = nameof(GetByIdAsync);
            var routeValues = new {productId, id = user.Id, cancellationToken};

            return CreatedAtAction(actionName, routeValues, response);

[HttpGet("{id:guid}")]
    public async Task<ActionResult> GetByIdAsync(Guid productId, Guid id,
        CancellationToken cancellationToken = default)
    {