Have you tried to access the account using another browser, or possibly another device?
Also, try to access via VPN, just enough to remove the doubt that your IP address is not on the blocklist of the firewall.
The account was Last Active: 24 August 2025, 19:02:12, and as notocactus stated, there is no indication that the account has been banned.
I just did so now. Same issue. Shows: "
An Error Has Occurred!
Sorry Guest, you are banned from using this forum!
For security, your account has been locked. Email
locked...@bitcointalk.org"