HTTP 400 · Bad Request
HTTP 400 Other

When & why it happens

The encryption is already accepted; the operation would be a no-op.

Handling in gogram

Surfaced as *gogram.ErrResponseCode. Match on the message:

if err, ok := err.(*gogram.ErrResponseCode); ok { if err.Message == "ENCRYPTION_ALREADY_ACCEPTED" { // handle this error } }