Cannot create consumption function app plan

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.76

**Describe the bug**
Cannot create azure function app plan of type consumption? Get following error message:

_Invalid sku(pricing tier), please refer to command help for valid values_

**To Reproduce**

Run following command:

az functionapp plan create --name myplan --resource-group mygroup --location westeurope --sku Y1

or

az functionapp plan create --name myplan --resource-group mygroup --location westeurope --sku Dynamic

**Expected behavior**

Creates a consumption function app plan in azure

**Environment summary**
Install CLI version 2.0.76

**Additional context**
Have tried both Y1 and Dynamic and it doesn't work? Would be nice to have some examples what values it should be for the sku in the documentation also?