Cant login to dashbaord

when i try to login it says what should i do?

Error 405 Not allowed!

Not allowed!

Guru Mediation:

Details: cache-bom18221-BOM 1588671895 4197186216

Varnish cache server

Hey @MisbaUddin,

you have an american account. Where did you try to login - on a EU-domain or on
I had no problems to enter.