connecting with azure log analytics

I'm trying to connect power bi to log analytics using https://docs.microsoft.com/en-us/azure/azure-monitor/platform/powerbi i am a global admin in the tenancy but no BI permissions i have a seperate partial admin to power bi .
when i input my query it asks for credentials when i try to add credentials i specify my tenancy global admin account as the organisational account but recieve an error Expression.Error: Access to the resource is forbidden.
i also recieve the same when i specify my power BI account
alternatively i have tried using webapi to authenticate but recieve a message of "a web api key can only be specified when a web api key name is provided " but can find no documentation on how to specfiy my key name or its value
any help would be much appreciated