STM32U575xx USBX CDC ACM only transmits less than 8 bytes

[HGT8721]

I am having issues with transmitting more than 8 bytes of data. If I transmit 12345678 everything works and I can see the data on my serial monitor. However if I transmit 123456789, then I do not get anything on the serial monitor. I have enabled the ZLP define and commented it out but still no lock. What am I not setting correctly here?

 

 

[FBL]

Hi ​@HGT8721 

Can  you share the FIFO configuration assigned to that IN endpoint?

[HGT8721]

Can you assist in letting me know where  I can find this?