The Primary IP is not the issue.
If you read the topic you can see that if I connect a device direct to the modem all is working (with the same Public IP.
Replaced the mikrotik with a new one (same model, same config) Netfilx works fine.
The router was hacked and the the device was changed, even a factory reset was not enough.
Need to netinstall the device.
Have the check if that works but did not do that yet.
Let you know.
Yes, that is true
The device was hacked and the hacker has changed the device.
also after a reset the issue was still there.
After a netinstall the problem was solved.
Then the device was clean.
A reset configuration was not enough.