Trouble connecting message_id with a new Campaign

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Hey there,

Been trying to create campaigns and provide the HTML of said campaign through API v3, but I can’t connect a message to a campaign through message_id.

Previously we’ve been using Create Message and Create Campaign requests from API v1, and that has partially worked.

Though the issue has been that once the campaign is created, the HTML it’s in a different format (broken layout, different typography, etc), and needs to be manually fixed using ChatGPT.

So I would like to ask:

  1. Anyone has been able to connect a new message, with a campaign through API v3?

  2. Anyone faced a similar HTML formatting issue when using API v1, and able to solve it?

Would appreciate any help!