Doc Merge not working / cURL Error 3 / 500 Server Error

Hi Devs,

We are currently trying to implement the Doc Merge feature on our on-site instance. When generating a document we get a 500 error on the GUI and in the log (debugging level) the following is thrown:

Tue Mar  5 13:27:17 2024 [2911543][d90f4525-9607-b173-8622-5667ed386d40][DEBUG] Document Merge: client: http: >>>>>>>>
POST /merge HTTP/1.1
Host: 
Content-Length: 651
User-Agent: GuzzleHttp/6.5.5 curl/7.68.0 PHP/8.2.14
Content-Type: application/json

{"mergeType":"convert","use_revision":true,"file_name":"Expert JV 2024","document_id":"9d084cd6-d79c-11ee-a31e-005056833a93","record_id":"da48e8c6-d6fc-11ee-8ba0-005056833a93","record_module":"prg_Programs","mergeRequestId":"b4301856-daeb-11ee-b84e-005056833a93","parent_id":null,"parent_module":null,"max_relate_records_retrieve":20,"metadata_hash":"aad9dc5b0328e97a69a530e92ad357ff","user_prefs_hash":"ea1450bbdcc6a555ee7c5bf4aeecddfd","token":{"access_token":"30547207-6586-4fa5-b826-060ac93910ce","expires_in":3600,"token_type":"bearer","scope":null},"instance_url":"https:\/\/[OURSYSTEM].[OURDOMAIN].de","unique_key":"d78123897ecce777f74af51d2da26ce2"}
<<<<<<<<

--------
cURL error 3:  (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)
Tue Mar  5 13:27:17 2024 [2911543][d90f4525-9607-b173-8622-5667ed386d40][DEBUG] Hook called: ::handle_exception
Tue Mar  5 13:27:17 2024 [2911543][d90f4525-9607-b173-8622-5667ed386d40][ERROR] An exception happened: ( 500: unknown_error)cURL error 3:  (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)

[OURSYSTEM] & [OURSDOMAIN] are placeholder 
SugarCRM ENT 12.0.4 On-Premise
PHP 8.2.14

My current suspicion is that the interaction between GuzzleHttp curl and PHP is generating this error.

The question is: Does anyone have experience with the separate update of the libraries?

Do you have any other opinions or experiences on this subject?

Kind regards.

Martin

AVM GmbH
IT Applications