It should be added to melee weapons across the board once a paladin hits level 11.

You just add it yourself by customising the attacks. Simple enough.

I know I can, I already have. But I feel like this is a pretty simple fix that should implemented.

Quote from Cyb3rM1nd >>

You just add it yourself by customising the attacks. Simple enough.

 How, exactly? You can't combine damage dice, nor damage types on weapon attacks as far as I can see. You can write in "+1d8 radiant" in the notes, but that's a bit crude.

Our Paladin just got to level 11, so we've just run into this.  You still have to manually add it in to customize.  I cannot even create an item that does this.

I'm now running into the exact same issue and I have no clue how to solve this. I can't customize the attack to add a die roll, only a fixed value. I can't create a homebrew weapon that simply sets the weapon damage to 2d8. I can add a note, sure, but that doesn't help when you want to roll the digital dice on dndbeyond - you'd always have to add another d8 to it manually.

I just make a custom action with 1d8 damage. 

I use Avrae and I successfully created a homebrew item in DNDBeyond that carries the Improved Divine Smite Damage with attacks made with it.  I had to customize the item and add this in the modifiers section:

Modifier Type: Damage

Modifier Sub Type:  Radiant

Ability Score: Str

Dice Count: 1

Dice Type: 1d8

Duration Interval: 10000

2nd block of Duration Interval: Day

NOTE: Without the ability score set to STR and the duration interval set (it doesn't have to be 10000 I was just feeling silly) it won't work.  

Quote from Vanya_42nd >>

I use Avrae and I successfully created a homebrew item in DNDBeyond that carries the Improved Divine Smite Damage with attacks made with it.  I had to customize the item and add this in the modifiers section:

 

Modifier Type: Damage

Modifier Sub Type:  Radiant

Ability Score: Str

Dice Count: 1

Dice Type: 1d8

Duration Interval: 10000

2nd block of Duration Interval: Day

 

NOTE: Without the ability score set to STR and the duration interval set (it doesn't have to be 10000 I was just feeling silly) it won't work.  

 I see how that adds the note of +1d8 to the end of your weapon's listed damage, but for me it does not factor into the roll, even with this edit. The sword I am wielding should hit at 1d8+14 damage prior to divine smite, then an additional 1d8 after that. But it's still only doing 1d8+14.

I am kind of baffled that this error has been known for over three years and hasn't been fixed.  Is there anywhere on D&D Beyond to report it to?

D&D Beyond Support told me today that this feature has been added!

It has! For anyone looking at their character sheet for it, go to Actions, click the Other tab and you should see Improved Divine Smite there. 

Creating it as a separate "action" was really not the best way of solving it, but I guess it's better than nothing.

As far as I can tell, it automatically adds the extra 1d8 to the damage I roll for my melee weapon attacks.

Really? Interesting. It doesn't do that on my paladin. Not even on a brand new paladin I just created. Where do you see this?

Quote from Asherett >>

Really? Interesting. It doesn't do that on my paladin. Not even on a brand new paladin I just created. Where do you see this?

When I click on the weapon damage and D&D Beyond rolls the dice, it rolls the normal weapon dice plus an additional d8.

Quote from szwanger >>

Quote from Asherett >>

Really? Interesting. It doesn't do that on my paladin. Not even on a brand new paladin I just created. Where do you see this?

 

When I click on the weapon damage and D&D Beyond rolls the dice, it rolls the normal weapon dice plus an additional d8.

 This is not native functionality of D&D Beyond at this time and is likely the product of an unsupported, third party extension you may have installed such as Beyond20