Hi
Javier Outón •,
Thanks for your patience.
I have tried to replicate the scenario by creating Azure Cosmos DB PostgreSQL by enabling Vector extension.
Kindly use command: SELECT CREATE_EXTENSION('vector');
OR
CREATE EXTENSION vector;
Result if shows like above that vector already exists, means it is enabled.
Refer: https://learn.microsoft.com/en-us/azure/cosmos-db/postgresql/reference-extensions#pgvector-extension
https://github.com/pgvector/pgvector#installation-notes
Please try and let us know the result. If you face any issue, do reply so that we can further investigate.
If this answers your query, do click Accept Answer and Mark Helpful for the same. And, if you have any further query do let us know.
Thank you.