Thank you for posting in the Developer Forum. As shared in that post, “the Web SDK only supports hosting meetings that were created on your account. Unfortunately, there isn’t a method to get around this currently.” Therefore is no way to create a Zoom meeting under a different account . Have you considered any alternative workflows which involve creating meetings from your account?
I wanted to circle back to update this post. Leveraging OAuth, you can get a Zoom Access Token (ZAK) and start external user’s meetings on their behalf with the Web Meeting SDK. This functionality/workflow was introduced in Web Meeting SDK 2.3.5. Here our help documentation on this topic for reference: