bind irx4 lite with multiplex m-link receiver

[Franz-Royer]

I can't bind an rx7dr light m_link receiver with the irx4 lite multi.
Firmware ethos 1.5.19 EU on frsky x20.
Firmware irx4 lite is 1.3.4.0
Luascript is installed on the transmitter, latest version.
The module works, I can bind the Spektrum receiver. I can also bind the Goosky s2 without any problems.
I have already reset the M-Link receiver.
no matter how I try it always flashes the same

Can anyone help me?

Lg Franz