Can´t add Federated Users to group chats.

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Steps to reproduce

1. Add a Federated Server as trusted server
2. Create a group chat, try to add an user via their federated cloud ID

Expected behaviour

User should be added to group chat.

Actual behaviour

User isn´t added, but error "An error occurred while adding participants" displayed.
Federated sharing with the user via NC files works as intended.

Talk app

Talk app version: 22.0.17 on both sides

Custom Signaling server configured: no

Custom TURN server configured: no

Custom STUN server configured: no

Browser

Browser name: Chrome
Browser version: 151.0.7922.170

Server configuration

Nextcloud Version: 32.0.14.1 on our NC, 31.0.14.1 on Federated NC

Server log (data/nextcloud.log)

 "message": "Failed to create federation provider",
  "userAgent": "Nextcloud Server Crawler",
  "version": "32.0.14.1",
  "exception": {
    "Exception": "OCP\\Federation\\Exceptions\\ProviderDoesNotExistsException",
    "Message": "Cloud Federation Provider with ID: \"talk-room\" does not exist.",```
</details>

Reproduce the group-chat invitation flow using the listed Nextcloud and Talk versions, then start with the server log entry for the missing "talk-room" federation provider. Trace the federated participant-addition path until the provider failure is located; done means a federated user can be added to a group chat without the error.