Help Share google assistant automation

Hi, I followed this guide Google Assistant - Home Assistant to add google assistant integration to my home assistant.
It works perfectly but I’m not able to share it with another user. I followed the guide steps and every entity is visible in the second google account but when I start a routine I always get the error message “Mi dispiace, al momento non riesco ad accedere ad home Assistant” which is “I’m sorry, at the moment I cannot access to Home Assistant”
I tried to change the second account as “owner” but without success
What can I do?