@ArcherC8 Sign out now that I'm back on the network with the router? I'm not using VPN. Firewall is whatever comes with Windows 11 and I haven't changed any config on that (not do I know how really).

@ArcherC8 Thanks. Great idea! I tested it without the router and it works fine. So we know there is an issue with the router. How can I use this router and iCloud together?

I recently switched to an AX1800 router and ever since then, iCloud doesn't work. When I try to log in, it says "An error occurred during authentication. Please try again." I have tested this with...