I'm experiencing same.Guys,
I am receiving a boring in the call history, because it is not not activated.
I've tried to activate it through the Settings -> My device -> Backup and Restore -> MiCloud: Call history
But unfortunately it does not active.
I already tried to grant rights to access to the Xiaomi SIM Activation Service application through Settings -> Apps -> Manage Apps: Xiaomi SIM Active Service
But the APP Permissions option is disabled.
Does anyone know how to activate the call history "Xiaomi SIM Activation Service" ?
Maybe running some ADB command lines?
Who can help me or guide a path, I thank you.
Described right here:

New - Aurora (14 Ultra) Sim activation doesn't go through
Hi guys. I'm with Aurora (Global/EU), unlocked BL on 2.0.103.0.VNACNXM_15 (clean installed OS2.0.101.0.VNACNXM_15 and updated once via fastboot). Both sims works perfectly (calls/data), just Sim services (messages and calls sync) doesn't go through. Tried restarting before/after adding sim...

One guy had offered flashing modem, but it doesn't help yet.