One possible cause for a handful of users having access issues but not others (or a handful of network setups, too) would be if the hosting environment is a load-balanced cluster with "sticky sessions" (meaning each user's session cookie or bearer token is "pinned" to a specific application server by the load balancer), and one of these application servers has an outage.
Pure speculation though as I don't know offhand whether OMITT uses any load balancing at all.
Another possible cause is that you're all getting your delayed punishments from Santa for being naughty in 2025.
I wouldn't worry about it too much.