Korifey, I am also having a problem logging into the Portal from my PC (a Mac Mini) for 2 weeks. Same problem has happened at various times since I started using IB about 8 months ago. The IBKR app on my iPhone works OK and that's what I use to place orders, but I need to sometimes use the Portal from PC to get account statements etc.
I try the Portal Login from PC, this results in the normal notification on my iPhone to use the IBKR app to show my fingerprint there which works OK as usual. Then the PC should proceed to get me into my account but the problem is nothing happens on the PC. I tried the same procedure on my iPad instead of the PC and same thing happens, I cannot get into the Portal from iPad. Is this similar to your Portal Login problem?