I am running NordVPN with no problems on Windows pc's as well as Android, if you are running a firewall as well you need to grant access to the vpn. What is your setup?
Win 10 has the latest updates. OS: ReviOs - 21H2 1.0 (november 6)Without more information I cannot try to help you, as per my original post, what is your setup.
For example is your phone Android or IOS? If IOS I cannot help you.
If you are running Android Lollipop the last version which works is 4.12.8_NordVPN.apk, 4.12.9 will not work successfully in most situations despite it being the last version which was supposed to work.
On your p.c there should be no need to open any ports as long as firewall access is granted, I have run NordVPN for a number of years now on Win10 and Win11 as well as Android 8,9,10 & 11 but I have held off from upgrading to Android 12 at the moment. On Android 11 it works successfully even through the NetGuard firewall.
The current version of NordVPN for Windows is 188.8.131.52, are you using a paid for account or something you have downloaded from elsewhere?
If you are using a cracked version the crack may have expired.
If you have paid for the app you can put it onto 6 devices with no problems be they ios, android, mac or windows. To save you anymore waiting time, if you have paid for it, I suggest you login to your account with your browser and contact their support team. They have been very helpful to me in the past and reply with 24hours.
If you are using a cracked version help is more difficult depending on whose cracked version you are using.