@Shannon Aung You are probably missing these permissions on your AAD. You can review and add them or move to a contributor role which should enable you to create a bot. Here are more details of the permissions that are required.
"Microsoft.Web/", "Microsoft.BotService/", "Microsoft.Storage/", "Microsoft.Resources/deployments/", "Microsoft.CognitiveServices/", "Microsoft.Search/searchServices/", "Microsoft.Insights/", "Microsoft.Insights/components/"