The mystery visitor does not come out

[SancaToril-1625]

They posted a note in the 21.4 live known issues thread

@GnomeSayin-11972

We are adjusting the appearance rate of Mysterious Stangers to be based on the relative level of the strongest Mercenary in your party compared to the suggested level of the Bounty. This move is to encourage people towards more engaging gameplay instead of repeatedly taking on low-level Heroic Bounties with highly over-leveled Parties.