Two AD accounts, need to have same email

NiagaraGuyany success with this?

I wonder what's the best practices when one user has separate accounts for privileged access and a standard user account. How do you receive messages for your admin account?

I noticed that there can be two accounts with the same value for the "mail" field in EntraID, and it works fine. The problem is if you sync with AADConnect. It tries to automatically populate the "proxyAddresses" attribute of the cloud user account object and it gives error. Apart from that error everything works fine. I've tried searching for best practices for two accounts for one user and nothing comes out of it. That's super strange for me, as normally companies use separate accounts. What I've encountered so far is that they simply don't use Azure/Entra notifications, sent to a mailbox, but that doesn't seem correct.