Constantly need to re-authorise Gmail

Hello! One of the scenarios I’m using uses Gmail connection to send emails. That connection for some reason needs re-authorisation every few days, otherwise the scenario doesn’t run and gives the following error:

Failed to verify connection 'Private GMail'. Status Code Error: 400
Failed to verify connection 'Private GMail'. Status Code Error: 400
Cannot initialize the scenario because of the reason 'Failed to verify connection 'Private GMail'. Status Code Error: 400'
Failed to verify connection 'Private GMail'. Status Code Error: 400

I suspect Google has set this authorization to expire every few days. Does anyone know how I can make sure it doesn’t expire?

This is a problem with free gmail. Did you setup the linked extra steps described here?

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I followed that guide to connect Gmail, yes. Do I need to take some extra steps to make it work without interruptions?