Hello, Ale1316.
Welcome to Microsoft Community.
From your description, I know that you have problems accessing some services or websites.
Your test direction is correct, and you should provide feedback to your ISP service provider.
Because you can use the VPN program to access normally, but direct connection cannot access normally.
The route of direct connection is: your computer->ISP network service provider->Microsoft or other service providers
The connection route of VPN is: your computer->ISP network service provider->VPN service provider->Microsoft or other service providers
Direct connection does not work, VPN is normal, which means that the ISP affects your communication with these services or websites.
As your test results show, other devices cannot access normally under the same network, which also proves that the ISP is affecting it.
If there are any updates, please feel free to reply.
Best regards.
Malygos.Z | Microsoft Community Support Specialist