External user invitation to repository

we have requirement to sent external user invitation to repository with read permission. For this we have used team membership claim. below is my claim.
```
apiVersion: team.github.upbound.io/v1alpha1
kind: TeamMembership
metadata:
name: some-team-membership
spec:
forProvider:
role: member
teamId:
username:
providerConfigRef:
name: default

apiVersion: team.github.upbound.io/v1alpha1
kind: TeamRepository
metadata:
name: some-team-repo
spec:
forProvider:
permission: pull
repository:
teamId:
providerConfigRef:
name: default
```
When we sent invitation to user, its asking user to perform sso authentication.
Could you please help to send external user invitation without sso?

When i add external user to a repository manually. External user is able to accept the invitation and read the repository content.