have you tried Whatsapp business app if you have already done this then try a modified version of Whatsapp like GBWhatsApp with the help of this app you can use dual whatsapp at the same time for more further info visit this https://gbapps.net/gbwhatsapp-apk/
I am using samsung for more than 3 years. I am using Jio4GVoice messenger on my smartphone and the dual app install is possible with it and facebook messenger too. also i am using a number of other messengers like yowhatsapp apk, whatsapp, Line app, snapchat etc. all the dual apps are installed on it.
Do you mean dual messenger account or dual messenger app, you can use a dual account on messenger but you cant install two messenger app on your device except you download gbwhatsapp apk or another messenger app for android.