Meta Avatar load fails with 'Failed to retrieve Avatar Specification' when using Federated User Ids

As of the 15th February 2023 Meta avatars being loaded using Federated UserIds as specified in the Cross-Play section of the documentations will not load. I get the following errors:

[ovrAvatar2 native] stats::url file transfer failed: http response code: 500

[ovrAvatar2 native] specification::Failed to retrieve Avatar Specification for user id 535713845439867

This was working fine just yesterday so I assume something has changed in the backend to cause this problem. This isn't the first time we've had problems using the Federated User Id system and its making it hard to justify keeping Meta Avatars in our product.