I have enter this number - 4A/2 in applicant address field , but the IRCC application not accepting /, So If I apply like 4A2 my address get differed from ID proof, can anyone advise please
It's already hard to differentiate so I'd just do another dash. If you want, you could try a different symbol that is accepted, but I can't suggest what will.
I suspect if they see the address on other documents it will be clear enough.
If you think it's that important, add a short letter of explanation.