Does Brynhildr prevent the play of tokens such as from Viktor legend and/or Vanguard Armory?

No, Brynhir Thundersong does not prevent tokens from being created by Viktor, Leader or Vanguard Armory.

According to RiftJudge FAQ #6800, Brynhir Thundersong's "When you play me" triggered ability prevents opponents from playing cards, but it does not affect tokens, because tokens are not cards (as specified in Rule 182).

Here is the breakdown of the interactions:

• Viktor, Leader: Viktor’s ability is a triggered ability that creates a token. Because this is an ability effect creating a token—not you "playing a card"—it is unaffected by Brynhir.
• Vanguard Armory: Vanguard Armory has an activated ability that creates tokens. Similar to Viktor, using the Armory’s ability is not the same as "playing a card" from your hand or a hidden zone. Therefore, Brynhir does not stop you from activating the Armory or the Armory from resolving to create its tokens.

In summary, because tokens are not classified as cards, Brynhir’s restriction does not apply to them.