Can't upgrade static web apps github setting

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Related command**

az staticwebapp update --name static-webapps --source https://github.com/xxx --branch main --token {{PAT}}

**Describe the bug**

When trying to update existing static web app with new private github repo setttings there is an error
Error code
BadRequest
Message
RepositoryToken is invalid. Please ensure the Github repository exists and the RepositoryToken is for an admin of the repository.
But when you create new one with the same token - everything ok.
When you trying to update existing static webapp with public github settings - everything ok
Problem related only updating private github repo settings.
Is there any chance to create new static web app without github part and then update to use with private github repo?

**To Reproduce**

az staticwebapp create -n {{MyStaticAppName}} -g {{someresourcegroup}} -l eastus2
az staticwebapp update -n {{MyStaticAppName}} -g {{someresourcegroup}} --source {{https://github.com/private_repo}} --branch {{master}} --token {{PAT}}
**Expected behavior**

**Environment summary**

azure-cli 2.36.0 *
core 2.36.0 *
telemetry 1.0.6
Extensions:
aks-preview 0.5.42
Dependencies:
msal 1.17.0
azure-mgmt-resource 20.0.0
Python (Linux) 3.8.13
[GCC 9.4.0]

**Additional context**