In Okta, please switch the claims from being present always inside the ID token to being present on /UserInfo endpoint. In this way, you should be able to retrieve them successfully through the SDK.
Are you just looking to get the basic user profile information from your /userinfo call?
If so, are you including the ‘profile’ scope in your /authorize request?
If the question is why some of those custom claims are not appearing in the response from the userinfo endpoint, does the user you are testing with have values for these profile attributes? If there is no value present for an attribute mapped to a claim, the claim will not be included in the token/userinfo output.
Can you please add inside authParams{} an issuer with the issuer URL available in Okta under Settings tab inside the authorization server administrative window?
The final configuration should look like the following: