Installation Error after Profile Transfer - Battle.net and WoW

Greetings, Blizzard SupporT!

(I’m using GPT from here in hopes it helps translate the issue!)
I’m facing installation errors with the Battle.net client and World of Warcraft. This began after I transferred a profile from another machine. The error codes appearing are BLZBNTAGT000008FC and BLZBNTBNA00000006.

So far, I’ve:

  • Updated all system drivers and the operating system.
  • Removed WoW cache and Battle.net related folders from %ProgramData%.
  • Reinstalled the Battle.net client and WoW multiple times, with admin rights and under a new user account.
  • Disabled the firewall and antivirus as a test for potential conflicts.

These steps have not resolved the issue. A registry cleanup might be necessary due to remnants from previous installs.

I need guidance on resolving these errors. What are the next steps?

(me again!)
Thank you!