Errors are truncated, making it hard to know what is happening

swirt → credited RichardDavies → .

This one I have looked into, and as you suspected RichardDavies it is a limitation of Guzzle. And I have been frustrated by exactly this issue several times. In some cases the full error can be found in the php log, and sometimes not. I do not recall the specific situation under which they show in logs.

I will leave this issue open because I would like to address it in the documentation.

FYI When this happened to me, it truncated the message at the critical part. i.e. "An error occurred because you must... (truncated)". I ended up having to use Postman with the XML shown on the queue page to manually issue the API call and reproduce the error so I could see the full message.

I added an FAQ to cover this.

The notes went out as part of 8.x-1.10 →
However this issue needs more work so making it active.