Default [Q] Can't reinstall Mail and Exchange after debloat

I did debloat using this:
I missed the part where it removes the built-in mail and exchange server function. When I tried to reinstall the two using the apks included in the thread, I am getting "x Application not installed" error. The exact files are SecEmail_J.apk and SecExchange.apk. They both are giving me the same error.
Any idea to reinstate the two apps?