Can't access Study mode on ChatGPT website / IOS application
I have a Plus ChatGPT account. I used study mode several times, then button for it has disappeared from chatgpt website. I can't access it in probably all browsers (tried firefox, safari, google chrome) and any operating system (tried Ubuntu and macOS). At the same time this button has disappeared in IOS chatgpt application (IOS 26.3.1). However, when I log out I can access it.
I tried to connect through mobile data and without VPN, as I was advised on ChatGPT support website, but nothing worked.