Having connection problems

I am having connectivity issue with NordVPN. I am using two ISP’s. Everything is good with one but getting no connection on other. Strange part is free vpn’s from google play store work alright.
Tried manual connection method,ikev2,obfuscated servers, onion over vpn nothing works. how this is possible?
If ISP blocks VPN’s why does free VPN’s work. If they have blocked NordVPN then how come even obfuscated servers don’t work?

Sounds like the second ISP is blocking VPN access, one providers can get blocked others not. I’d suggest switching the protocols to UDP and TCP, also saw some people saying Cloudflare DNS helps, and of course, you should contact Nords support if nothing helps.