I'm waiting for the official support reply..

Yes!

As you can see, i've tried with an TD-W8970 and an Huawei E3372 USB key, and have the same issue! At now, i can use the public IP ONLY using a HUAWEI B683 that works perfectly! Is important for me to...

Sorry, I made a mistake with the images (i'm tryng with other TP-Link models, USB models with LTE key and have same issue!) Here is the correct images. BEFORE authentication: AFTER authentication:

Sorry, I made a mistake with the images (i'm tryng with other TP-Link models, USB models with LTE key and have same issue!) Here is the correct images. BEFORE authentication: AFTER authentication:

This is the abnormal page that appear!