3 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

When this card's <Your Turn> effect activates and I , when exactly does this happen?
The effect triggers "when this Digimon would digivolve," so it occurs after declaring the digivolution, but before paying the digivolution cost.
Ruled Mar 28, 2024
Does this card’s <Your Turn> effect also activate when DNA digivolving?
Yes, it does.
Ruled Mar 28, 2024
If I have 3 or fewer security cards and this Digimon would digivolve, but the digivolution cost can no longer be paid due to the inherited effect of my opponent's [EX3-016]/[SnowAgumon], [EX3-019]/[Paledramon] or other cards and the digivolution fails, can this card's activate?
Yes, this card's effect reads "when this Digimon would digivolve", so it activates. In that case, the effect activates even if the digivolution fails, so the activates.
Ruled Mar 28, 2024
Got a line that uses Angemon? Map it in the builder and share it with a link.
Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.