"Invalid input" error when using POST request in HTTP Request block

I need to send JSON in an HTTP Request block. But what is saved to the variable is always stringified, so I just keep getting errors. Please help!

No matter what I do, I can’t get the JSON post call to work. If I have to resort to using Make.com for that, that defeats the purpose of being able to use one tool to bring data into my preferred platform (Tana). If I can’t solve this issue, I’ll have to jump to an alternative.

I replicated what I want done in Make. I copy/pasted the JSON that is spit out, into MindStudio. Same error. I give up.

I lied. I can’t give up on this thing. Because it doesn’t make any sense. I’ve done every possible configuration myself and ChatGPT could think of…

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Are you passing valid JSON? (e.g. did you escape spaces or extra symbols that can break JSON formatting like ’ or ")

Could you please send over a screenshot of the error and the exact input you’re testing with?

This will help us troubleshoot what’s going on.