Might try changing to Google DNS just for laughs. Easy enough to switch back to Cloudflare.
It defiantly never hurts to change DNS, Open DNS is another good one.
But going by what the Topic starter has stated, Disney+ loads in browser.
So that leaves either an issue with the streamfab install or firewall and antivirus issue affecting streamfab.
Best they can do is temporarily disable any antivirus and firewall.
I think that’s why I use Windows default Firewall, and I added malwarebytes to rid the computer of anything else that may affect things. Windows Defender/antivirus is good in most cases.
I just needed the added security of malwarebytes.