Hello,
I wonder, if there is a way to get Ads account id of oauth authenticated user?

Hello,

Thanks for reaching out. You can try this endpoint GET accounts/:account_id/authenticated_user_access

but where do I get an account_id for this request? accounts/:account_id/authenticated_user_access

I have only user_id, access_token, secret_token and screen_name of authenticated user

And user_id != account_id

Hello,

You can perform the API call to the endpoint GET accounts to retrieve the account ID