@Rickyb2  I have the same/similar issue!  Now my tether app is unable to be pulled up via my phone because it is unable to connect to internet??? Have you resolved the issue? 

  @KSAM 

I have not resolved the issue. No one from the to-link team has chime in.

I cannot manage the router via mobile app.

The wifi works with all of my devices, I just can't login to the router.

  @Rickyb2 I am having this same issue after updating my AX50 this evening. Can't find any resolution either!

  @Burkey2k 

I'm still experiencing the same issue.

I can't login to the router via mobile app. Via PC works fine.