Bad registrar on 365 side

Hello,

We created a Microsoft 365 tenant several years ago but never used the online email services.

We added and verifed our domain, which was registered with Orange at the time, and then created some users manually to use PowerBI.

Today, we begin to migrate to Exchange Online. We have installed AD Connect and synchronized some users.

Since creating the tenant, we have changed registrars (to Gandi), but I've noticed that the registrar hasn't been updated in the tenant 365.

 An `nslookup` correctly identifies Gandi as our current registrar.

 Microsoft has remained with Orange...  and this is causing errors in the hybrid Exchange configuration assistant due to bad autodiscover.

 How can we "refresh" the registrar on the Microsoft 365 side ?

Thanks for your advises

Nicolas