We have been working on our project to implement OIDC with ARC and in our case that the date of birth is a mandatory field we would need it to be included in the OIDC scope so that when a user registers in ARC from OIDC it includes this field.
Thanks
This will be released with 1.90 in late October.
Thank you for the request. We are working on pulling this data from the OAuth token and adding it to the user's profile. I will update you when we have a timeline for releasing this.