This seems to be an account-wide issue, as I tried on my phone as well (on google chrome as well) and was unable to open it - it loaded for almost a minute, and then gave me the same error.
I also tested it on Safari on iOS this morning on a different connection, and received the very same error - so it’s definitely something to do with my account.
@Flak Would you perhaps be able to pass this on to the team? I’ve got a big game launch coming next week and I need to be able to schedule a campaign for it. Thank you regardless