Anywhere Access "Something went wrong" R6700V3

Does the Android app work apart from Anywhere Access?

In theory, Anywhere Access gets turned on by default:

Why is Anywhere Access enabled by default on my NETGEAR or Orbi router? | Answer | NETGEAR Support

Note the bit about managing a router with Anywhere Access.

If you find that Anywhere Access is not enabled, you could try a "factory reset".

How do I perform a factory reset on my NETGEAR router? | Answer | NETGEAR Support

Bit of a nuisance. You can backup your settings – always a good idea anyway – before you try that. Just in case it fails and you want to restore the settings.

How do I back up the router configuration settings on my Nighthawk router? | Answer | NETGEAR Support