Copilot add OpenAI connection

Working with the system 'conversational boosting' topic. Attempting to configure Azure OpenAI as the datasource.

Have already created connection to OpenAI in PowerApps. Have added a single Word document to the AI Search service, index/indexer created. When I select the connection as datasource in Copilot Studio (topic>data sources>edit>classic>Azure OpenAI Services on your data), receive the following errors :

Missing required property 'ApiVersion'

Missing required property 'Deployment'

There is an error 'EmptyCollection'.

Please advise