Thanks KenvinTheJedi, I made a typing error: office_access instead of offline_access
So now it's ok !

thanks to you I have made progress in my configuration and I no longer have the same error.
I have changed this like the documention (https://docs.osticket.com/en/latest/OAuth2/Microsoft%20Authorization%20Guide.html)

https://i.imgur.com/ZHezMrj.png

In the apache2 global conf : etc/apache2/apache2.conf i have changed AllowOverride none by AllowOverride All
https://i.imgur.com/RsPbLLn.png

Here’s my osticket conf
https://i.imgur.com/w9juS6C.png

Now when I send the auth2 configuration, the browser ask me to authenticate to microsoft 365 then I have this error :
https://i.imgur.com/3o4BzUs.png

My scope is like this :
https://i.imgur.com/DnrSaTn.png

Hi KevinTheJedi
I have the same problem...
Allways this message : The requested URL /api/auth/oauth2 was not found on this server.

Apache osticket conf :
https://i.imgur.com/8wCO2Qs.png

.htaccess in the folder api
https://i.imgur.com/31dtaYi.png

With webmin, i can see that the mod rewrite in enable
https://i.imgur.com/dAHvY10.png

Conf Oauth2 :
https://i.imgur.com/eGy3BmQ.png

I don't understand...
do you have any technical advice for me?