Append claim in actions v2

Hi, I am trying to use actions v2 to append claims with the preuserinfo function.
I am using FastAPI for my "actions micro service". At the moment I just return this json:

 {'append_claims': [{'key': 'test', 'value': 'test'}] }

 {'append_claims': [{'key': 'test', 'value': 'test'}] }

 {'append_claims': [{'key': 'test', 'value': 'test'}] }

 {'append_claims': [{'key': 'test', 'value': 'test'}] }

But this seems to be ignored when I call the userinfo endpoint.
What I am doing wrong?

Ask Inkeep•10/23/25, 6:47 AM

Hi @Weltenbrand, I'm an AI assistant for ZITADEL. While a team member reviews this question, I'll see if I can find relevant sources for your question.

Ask Inkeep•10/23/25, 6:47 AM

Answer

I wasn't able to find a direct answer, here are some relevant sources:

Using Actions (1) :

This provides the expected JSON structure for Actions v2 webhook responses and explains how ZITADEL sends HTTP POST requests to your endpoint.

questions-help-bugsActions v2 - Function PreUserinfo questions-help-bugsActions v2 - Function PreUserinfo :

This discusses similar issues with Actions v2 PreUserinfo function where claims aren't being set properly despite correct webhook responses.

Ask Inkeep•10/23/25, 6:47 AM

To learn more, see the sources I considered:

[1] Using Actions
questions-help-bugsActions v2 - Function PreUserinfo

Ask Inkeep•10/23/25, 6:47 AM

Feel free to tag @Ask Inkeep with additional questions.