machineelf
Explorer
Except my DM has stated that the BA cannot be used to attack - I must have an ability which allows 2 attacks when I choose the Attack for my Action.
Yeah, your DM is wrong. This is often the problem with playing with DMs who don't know the rules well or (more importantly) aren't humble enough to consider that they may be wrong and take some time to research that rule.
There have been multiple occasions where I thought for sure I knew a rule perfectly, but one of my players corrected me. And I think one of my strengths as a DM is that if a player is adamant about a rule, I will will listen to what they say and take another look at it to see if I have had it wrong this whole time. It really burns me when DMs are too hard-headed to do that.
The whole point of dual wielding is that it allows the character to attack with the off-hand weapon using their bonus action.