Google Sheets API CONNECTION

Hi:

Do you know why this error is generating for? & why there is no option to change to OAuth 2.0?

Welcome to the community @Ruta_Covid!

That is a sign that you did not format the private_key correctly. Please make sure to replace all \n with a new line as described as step 11 here:
https://docs.n8n.io/nodes/credentials/Google/#using-service-account

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