Difficulty using sp_OAMethod [MSXML2.ServerXMLHTTP] to post multipart/form-data - sql-server

Question

Code attempts to post a multpart form to API service. which does not recognize it as multipart.
(Content should be multipart)
The request works fine in Postman, I think I could trouble shoot it if I could see the actual HTTP request being sent.
CREATE PROCEDURE [dbo].[test_QAAPI_attachments]
as
BEGIN
SET TEXTSIZE -1;
Declare #Object as Int;
DECLARE #hr int;
Declare #json as table(Json_Table nvarchar(max));
DECLARE #contentType VARCHAR(8000);
DECLARE #contentTypeForm VARCHAR(8000);
Declare #url as Varchar(2048);
Declare #errorDesc as nvarchar (max);
Declare #len as int;
DECLARE #resp int;
DECLARE #jsonText nvarchar(max);
DECLARE #authHeader as varchar(4000);
DECLARE #ret Int;
DECLARE #token Int;
DECLARE #responseText VARCHAR(8000);
DECLARE #runMode as varchar(5); -- run, test, train
SET #contentType = 'application/json';
SET #contentTypeForm = 'application/x-www-form-urlencoded';
DECLARE #moduleReference varchar(2);
DECLARE #formattedAccount varchar(21);
DECLARE #fileBinary as varbinary(max)
Declare #jsonReturned as varchar(max)
Set #errorDesc = 'No Errors'
SET #contentType = 'application/json';
set #url = 'https://qaapi71.auth.civicalg.com/main/api/v2/authority/login'
SET #jsonText =
'{
"userName": "apitest",
"password": "[REMOVED]"
}'
-- Getting the accessToken from Authority API...
Exec #hr=sp_OACreate 'MSXML2.ServerXMLHTTP', #Object OUT
EXEC #hr= sp_OAMethod #Object, 'open', NULL, 'post', #url, 'false'
EXEC sp_OAMethod #Object, 'SETRequestHeader', null, 'Content-Type', 'application/json'
EXEC sp_OAMethod #Object, 'send', null, #jsonText
EXEC sp_OAMethod #Object, 'responseText', #json OUT
INSERT into #json (Json_Table) exec sp_OAGetProperty #Object, 'responseText'
Select #authHeader = 'Bearer ' + f.accessToken
FROM OPENJSON(
(select * from #json), N'$.result')
WITH (
accessToken nvarchar(4000) N'$.accessToken'
) as f
Delete #json
DECLARE #formBody varchar(max);
set #url= 'https://qaapi71.auth.civicalg.com/main/api/v2/recordManagement/attachments'
-- text below copied directly from successful Postman http request...
SET #formBody='
----------------------------028844704192657132624492
Content-Disposition: form-data; name="apiVersion"
2
----------------------------028844704192657132624492
Content-Disposition: form-data; name="ModuleReference"
DD
----------------------------028844704192657132624492
Content-Disposition: form-data; name="FormattedAccount"
002.2020.00005653.001
----------------------------028844704192657132624492
Content-Disposition: form-data; name="ExternalDocumentType"
UPLOAD
----------------------------028844704192657132624492
Content-Disposition: form-data; name="Description"
some description
----------------------------028844704192657132624492
Content-Disposition: form-data; name="FileName"
test.jpg
----------------------------028844704192657132624492
Content-Disposition: form-data; name="FileUpload"; filename=""
----------------------------028844704192657132624492--'
-- final [--] indicates the end.
DECLARE #boundary as varchar(200)
SET #boundary='----------------------------028844704192657132624492'
DECLARE #L as varchar(20)
SET #L=CAST (len(#formBody) as varchar)
-- Open the connection.
EXEC #ret = sp_OACreate 'MSXML2.ServerXMLHTTP', #token OUT;
IF #ret <> 0 RAISERROR('Unable to open HTTP connection.', 20, 3);
-- Send the request.
EXEC #ret = sp_OAMethod #token, 'Open', null, 'POST', #Url, 'false';
EXEC #ret = sp_OAMethod #token, 'setRequestHeader', NULL, 'Authorization', #authHeader;
EXEC #ret = sp_OAMethod #token, 'setRequestHeader', NULL, 'Content-Length',#L;
EXEC #ret = sp_OAMethod #token, 'setRequestHeader', NULL, 'Content-Type','multipart/form-data','boundary',#boundary;
EXEC #ret = sp_OAMethod #token, 'send',NULL, #formBody;
EXEC sp_OAMethod #token, 'responseText', #responseText OUTPUT
INSERT into #json (Json_Table) exec sp_OAGetProperty #token, 'responseText'
select #formBody
select * from #json
END