Can I use this card's [End of Your Turn] effect to activate a [When Digivolving] effect on another card that was given a "can't activate [When Digivolving] effects" effect?
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No, you can't. However, if a card with an [On Play] [When Digivolving] effect was given a "can't activate [When Digivolving] effects" effect, you can use this card's [End of Your Turn] effect to activate that effect as an [On Play] effect.
Source: BT24-102 Homeros