This article explains how to resolve issue when mobility scanner unable to scan 2 and 3 character barcodes.
Example barcode - A1 or A01 (2 characters, or 3 characters) - won't scan, no error, no beep, nothing happen
But other barcodes, can scan properly. PDF attached under Related Information.
Current minimum length is 4 characters.
Please change the setting in scanner (android) "ReaderConfig" and test again.
Setting as below:
ReaderConfig > 1D Symbologies > Code 39 Detail > Minimum Length
Note: Screen-shot is from scanner model Cipherlab RS50
Attaching docs. "NONWORKING.pdf" is sample barcodes.