I'm unable to save any vapi worfklow after I adding an end call node. Even if I load a sample one like Customer Satisfaction Survey and modify the text on one of the end call text. I got this error: Failed to save workflow: each value in nodes.tool.server.credentialId must be a UUID

Action Step: Please create a screen recording of the error, note your browser and OS, and copy any console errors (press F12). Then submit this information to Vapi support as described in the [Issue Reporting documentation](https://docs.vapi.ai/issue-reporting). This will help the team diagnose and resolve the "credentialId must be a UUID" error quickly. Source: - [Issue Reporting documentation](https://docs.vapi.ai/issue-reporting)

If I just create a new empty worklfow. Add directly and end call node I can not save it. In the json I can see when I add an end call it has this part: "server": { "credentialId": "", "timeoutSeconds": 20, "url": null }, that cause the issu https://cdn.discordapp.com/attachments/1463106919806931131/1463126930671796254/Kepernyofoto_2026-01-20_-_11.21.41.png?ex=6970b2a3&is=696f6123&hm=89517f260401a3d482f520441d788b56872574698f82902bf96dd4d267dc019e&

Kindly checkout Vapi Squads ([https://vapi.ai/blog/introducing-squads](https://vapi.ai/blog/introducing-squads)). Vapi Workflows has been discontinued in favour of Squads. Squads is much more capable and simpler than workflows. Because Workflows is no longer actively supported, our ability to assist with Workflow related issues is limited. I am sorry for any inconvenience this may cause. Thank you

I have to ask 20 question from the user. And sometimes I have to skip questions based on the answer. I wanted to use workflow to go throw all the question.

Hi, Vapi Workflows are deprecated and no longer supported, which is why you’re unable to save workflows. For your use case, we recommend using a single assistant with structured prompting to handle all questions and conditional logic, or Squads if the flow can be split into sections. Thanks, Shaunak