Add a @ before the ID, and after the ID a @ and mostr.pub = [@b761b35e14dfe7eadbeeb716bc47b9a2c1c703b2ee9827caa415a4e3b6a50cc6](https://mostr.pub/users/b761b35e14dfe7eadbeeb716bc47b9a2c1c703b2ee9827caa415a4e3b6a50cc6 )
As with a mastodon user on a different instance, it could be that you don’t see all their previous posts immediately.
If a nostr user quotes a post, I don’t think you can see the quoted post on mastodon. There are probably bugs in the other direction as well.