I sometimes turn my stickies into cards when I want to @mention or assign someone to look at them. 

@Colleen Curtis you cannot @mention in a card either. The only option is assign which is limited to one assignee.

According to the Mention Help Center article, @mentions only work in Comments. I suppose that is the only around here (a mention in a comment on a sticky).

Mentions also work in Visual Note comments (slightly different than standard comments?):

https://help.miro.com/hc/en-us/articles/360035713254-Visual-notes

But, yes I would like to see mentions work anywhere you can add text :)

Being able to @-mention would be great! Especially in cards.

Hi @Kevin Kinisky, @Robert Johnson, @Diana Mathioudakis, @PedroS00, @John Choi, @Jonah Chambers, @Enrique Velazquez, @Teodora Valova ​​​, @Enrique T. Altarejos Martínez, and @Henrik Ståhl! 👋

I’m happy to let you know that you can now use mentions to reference teammates on text-based widgets, including Sticky Notes, Shapes, and Text. 

Check out the mentions updates announcement to learn more about what else was improved. Please give it a try and let us know how it works for you. I’m looking forward to hearing your feedback. 💪