Tesla Fleet Integration - Key pairing issue?

I have been setting up a clean Tesla Fleet integration as per documentation.
My public key is hosted on a local webserver behind a Nginx Proxy Manager where I copied the file in /.well-known/appspecific/com.tesla.3p.public-key.pem and https://subdomain.mydomain.ext is accessible from outside world (just a plain index.html page in the folder)
Setup worked fine, my two cars are in the home assistant and sensors are correctly updated.

But sending commands doesn’t work despite a succesful installation of the keys through https://tesla.com/_ak/subdomain.mydomain.ext on my Android app. (notification of key addition received, key on subdomain.mydomain.ext is displayed among the keys in vehicle).

I get two error messages:

• Command failed: Vehicle did not recognize the key used to authorize command. Make sure your key is paired with the vehicle after restarting home assistant
• Failure of button/press action. 'Session' object has no attribute 'epoch' when I try again afterwards.

Anyone has any idea of what I am doing wrong?

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