Actually found a new error in the logs, I redo the connection and the connection went all fine, then as it was getting the schema, the logs show
airbyte-worker | 2022-07-25 03:53:31 INFO i.a.w.i.DefaultAirbyteStreamFactory(lambda$create$0):61 - com.mongodb.MongoCommandException: Command failed with error 16872 (Location16872): 'Invalid $project :: caused by :: '$' by itself is not a valid FieldPath' on server ******-mongodb-*********.mongo.ondigitalocean.com:27017. The full response is {"ok": 0.0, "errmsg": "Invalid $project :: caused by :: '$' by itself is not a valid FieldPath", "code": 16872, "codeName": "Location16872", "$clusterTime": {"clusterTime": {"$timestamp": {"t": 1658721211, "i": 1}}, "signature": {"hash": {"$binary": {"base64": "oLCX8Zp145uTrWSNBNIsluDvtjQ=", "subType": "00"}}, "keyId": 7114990681650626562}}, "operationTime": {"$timestamp": {"t": 1658721211, "i": 1}}}