Writing and receiving string data with different characteristic uuids not successful

Good day friends i a with mit app i need your help.
i want to write and receive string with different characteristic uuid however writing is not successful unless i disable receiving characteristic uuid block then i can i write to arduino.
Again concerning receiving characteristic uuid I'm receiving more than 64 byte data so i request for MTU increase however enable this block too prevent the app from writing to arduino
with the image attach UUID_Char2 is writing to arduino and UUID_Char3 is receiving

Maybe do the registers in this event?

component_event

ask you may know, request must happened first before .MTUChanged event can run and when ever the request block is enable i can write to arduino

Perhaps if you post all your blocks, and the Arduino sketch (inline between ``` lines), one of our BLE experts can help. Be sure you have the current BLE aix version.