Looking at the topic of your question, when you go to the deeplink settings you have to tick the box "Include GET parameter". then on the microflow that runs after the deeplink is executed, you will have to add an input parameter with the data type "String". This string will contain the value after the question mark in your deeplink.
Thnx for you reply, but unfortunately I wasn't able to fill the "String" in the MF after executed Deeplink. Programatically I make deeplinks in a MF with these settings and commit it with events later in same MF.
Settings: (see attached image) image link