MyTeamspeak login dont work

Hey, i cant login in my Myteamspeak account in ts3 Client. On the Myteamspeak Website it work.

Log :
24.04.2020 14:07:39 SCHandler Info try to delete mytsid while no valid mytsid is set - abort
24.04.2020 14:07:42 ProtobufRPC Warning Error contacting URL SSL_ERROR: Alert on protocol: TLS 1.2 level: fatal error: unsupported_certificate (43)
24.04.2020 14:07:42 ClientUI Warning Account login failed, server currently not available. Retry in few minutes.

Trying for some days now. But never Work. Email and Passwort is right.
Sync is enabled

MITM Attack on the TLS Connection, probably caused by your Antivirus. Disable HTTPS sniffing.

and how. I dont know what this is. Sorry. i Disabled my antivirus but it still dont work

What have you for a Antivirus and have you tried to deactivate your Firewall?

Gdata, and yes. Deactivatet firewall but still error

What OS are you using?
(There are some TLS 1.2 problems in some Windows versions)

This is the article I referred to last time: