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What does a "test connection" tell you ? 

The https://www.ibm.com/docs/en/sig-and-i/10.0.0?topic=messages-ctgimd830e basically tells you that your URL for the adapter may be wrong.

I suggest you raise an IBM Support case as the information you have provided here is not enough to resolve your problem.

HTH

Thank you for your reply.
The test connection was successful, and additions and changes are working properly.
I will open a case as you advised.

Navigate to the agent.conf file of the AD Adapter (typically under C:\Program Files\IBM\TDI\adapters\ad-agent\conf).
Add or modify the following line:
chunkedEncoding=false
Restart the AD Agent service.

Thank you for your reply.
The agent.conf you mentioned does not exist, but if the file does not exist, should I add it?

There is adapter.conf for DAML Agents like the AD Adapter - so please disregard that advice.

The chunked encoding error is something wrong happening between ISVG and the adapter - I cannot from your post see if you are running ISVG IM (in former version known as ISIM) or ISVG IGI. This is actually important as the Borkerage used in IGI is somewhat different than what is on the ISVG IM implementation - and here there is difference whether it is SW, VA or Container and also the operating system for the SW will play a role.

My best advice is to raise an IBM Support case and have our support professional help you out