Not able to create a Web App Bot through Azure portal, getting ServiceError: CreateAppOnlySteps

it seems like error : ServiceError: CreateAppOnlySteps is due to insufficient permissions.

Can you check, do you have access to create an APP Registration under Azure Active Directory.

If yes, follow below link and create an APP & Secret using below link :

https://docs.microsoft.com/en-us/azure/bot-service/bot-service-resources-bot-framework-faq?view=azure-bot-service-4.0#app-registration

Once you are done with App Registration, copy the APP Id, Secret and apply that during BOT Registration like below :

Try the above steps, it may work

Thanks !!!