Hi @popisn - Welcome to AWS QS community and thanks for posting the question. Can you please check with your network team whether there is any change in the firewall. This kind of issues occurred when there is any change in the network firewall.
i am getting the same error message but i just got the permissions this week for the first time an cant log in. contacted the it team, submitted a ticket an the ticket only had 3 people available to look into it for the ticket that was submitted, an 1 is out of the office for another week or so. as well it in the building tried to do a software update, cookie clear, an browser clear an it didn’t fix the issue.
chatted with 2 aws team members, both said the same thing permissions not granted, so doing a double check on that if the manager had given proper access.