Email sent with a gmail module being rejected from recipient server - SPF problem?

Hi there

I am using the GMail module to send an email to another email address.
When i look into my inbox in GMail, every email i send to that recipients are rejected, due to security policy from the recipient’s server.

I have the following error:

550 5.7.1 Security policy violation: sender address not authorized (duo-acl-milter: vmdr5tzn), servertime=Nov 12 13:43:48, server=idvduomailin04.services.datev.de, client=40.107.22.118

and when checking in details the email sent, I have this :
from engine-7f44d47d94-l8jjb.farm.integromat.com (ec2-52-31-156-93.eu-west-1.compute.amazonaws.com. [52.31.156.93])
by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-381ed9f8827sm15689840f8f.72.2024.11.12.04.43.42

I was thinking that i have to add a SPF record but I do not find which one i would have to add.