See https://learn.microsoft.com/en-au/azure/search/search-get-started-portal-import-vectors?tabs=sample-data-storage%2Cmodel-catalog%2Cconnect-data-storage#supported-embedding-models for the list of allowed embedding models.

Import and vectorize data in Azure only supports text-embedding-3-small if you create that model in Azure Open AI.

If you are creating the embedding model in Azure Foundry (studio) you need to use Cohere-embed-v3-english or Cohere-embed-v3-multilingual