[422] error inserting GPT-generated tags into Airtable multi-select field using callin.io

Hi all — I’m encountering a persistent [422] error when trying to insert GPT-generated tags into a multi-select field in Airtable using callin.io

Scenario Overview

• I’m using a GPT (OpenAI) response that returns a string of tags like:

mathematica

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Part A, Part L, Structural

• I split this string into an array with:

callin.io

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split(ComplianceTagsRaw; ", ")

(stored in a Set Variable called ComplianceTagsArray)

• I then try to insert this into Airtable’s Compliance Tags field, which is:

  • A multi-select field
  • With all expected tags predefined (Part A, Part L, etc.)
  • Map ON is enabled

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Problem

Despite this, Airtable keeps returning:

pgsql

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[422] Insufficient permissions to create new select option "split(ComplianceTagsRaw; ", ")"

Or:

csharp

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[422] Cannot parse value for field Compliance Tags

I’ve also tried using a Text Aggregator, but it results in this error:

bash

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[422] Insufficient permissions to create new select option "{"text":"{{3[7][1]}}"}{{3[7][1]}}"

This suggests callin.io might still be passing a raw string or an object when Airtable expects a flat string array.

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What I’ve Confirmed So Far

• ComplianceTagsArray is an actual array: ["Part A", "Part L", "Structural"]
• Predefined options in Airtable match GPT output exactly
• Map ON is toggled correctly
• All variables are resolved using {{ }} and not typed manually
• Wand icon is used to select values (not pasted formulas)

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Question

How can I reliably insert a split GPT tag list into a multi-select field in Airtable using callin.io?

• Do I need to use an array aggregator with a specific structure?
• Should I format it as an array of text objects or just strings?
• Is there a known quirk where callin.io sends an unresolved formula when mapping from a Set Variable?

Any screenshots, JSON example formats, or complete working flows would be greatly appreciated.

Thanks in advance!