SQL Server R Services dplyr column 'StudyID' not found in data

I'm re-factoring a script originally written in R Studio for R Services in SQL Server 2017. The stored procedure uses dplyr and is supposed to return the mean and standard deviation for responses to a given StudyID.

The stored procedure syntax is as follows:

ALTER PROCEDURE [dbo].[spCodeMeans]
-- Add the parameters for the stored procedure here
@StudyID int,
@StudyID_outer int
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here

BEGIN TRY

        exec sp_execute_external_script
        @language = N'R',
        @script = N'
            # Summary Mean
            #
            # Calculates the mean of all independent variables in a table of data
            # grouped by \code{code}. Note that independent variables are
            # identified as all columns matching the following pattern: the letter
            # "c" followed by a one-or-more digit number.
            #
            # @param x Table to summarize
            # @importFrom rlang .data
            #
            # @return Summary table where each distinct \code{code} value is
            #   represented by one row with columns for the respective means of
            #   each independent variable.
            #install.packages("dplyr")

            code_mean <- function(x) {

              `%>%` = magrittr:: `%>%`
              dplyr::group_by(x, .data$StudyID) %>%
                dplyr::summarize_at(dplyr::vars(dplyr::matches("c\\d+")), mean)

            }

            cmresult <- code_mean(x = clsdStudies)

            # Summary Standard Deviation
            #
            # Calculates the standard deviation of all independent variables in a
            # table of data grouped by \code{code}. Note that independent variables
            # are identified as all columns matching the following pattern: the
            # letter "c" followed by a one-or-more digit number.
            #
            # @param x Table to summarize
            # @importFrom rlang .data
            #
            # @return Summary table where each distinct \code{code} value is
            #   represented by one row with columns for the respective standard
            #   deviations of each independent variable.

            code_sd <- function(x) {

              `%>%` = magrittr:: `%>%`
              dplyr::group_by(x, .data$StudyID) %>%
                dplyr::summarize_at(dplyr::vars(dplyr::matches("c\\d+")), stats::sd)

            }

            sdresult <- code_sd(x = clsdStudies)
        ',
    @input_data_1 = N'
        Select Responses = 
        c.StudyID, c.RespID, c.ProductNumber, c.ProductSequence, c.BottomScaleValue, 
        c.BottomScaleAnchor, c.TopScaleValue, c.TopScaleAnchor, c.StudyDate,
        c.DayOfWeek, c.A, c.B, c.C, c.D, c.E, c.F,
        c.DependentVarYN, c.VariableAttributeID, c.VarAttributeName, c.[1] as c1, 
        c.[2] as c2, c.[3] as c3, c.[4] as c4, c.[5] as c5, c.[6] as c6, c.[7] as c7, c.[8] as c8
        from ClosedStudyResponses c
        where DependentVarYN = 0
    ',
    @input_data_1_name = N'clsdStudies',
    @params = N'@StudyID int',
    @StudyID = @StudyID_outer
    --@output_data_1_name = N'dfcm',
    --@output_data_2_name = N'dfsd'

  WITH RESULT SETS (
  (cmsresult varchar(MAX)),
  (sdresult varchar(MAX)))
END TRY

BEGIN CATCH
    THROW;
END CATCH
END  

When I run the stored procedure, and pass in a valid StudyID, I receive the following error:

Msg 39004, Level 16, State 20, Line 4
A 'R' script error occurred during execution of 'sp_execute_external_script' 
with HRESULT 0x80004004.
Msg 39019, Level 16, State 1, Line 4
An external script error occurred: 
Error in mutate_impl(.data, dots) : 
Evaluation error: Column `StudyID`: not found in data.
Calls: source ... as.data.frame -> mutate -> mutate.tbl_df -> mutate_impl -> 
.Call

Error in execution.  Check the output for more information.
Error in eval(ei, envir) : 
Error in execution.  Check the output for more information.
Calls: source -> withVisible -> eval -> eval -> .Call
Execution halted

How do I resolve this error so that the StudyID parameter is passed into the dplyr functions?