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Constellation

SIM CARD UNKNOWN, IMEI NOT SHOWING, AND ALSO SHOWING REGISTERING FAILED

After upgrading to Android 9 on 26th July 2020 at near about 5 PM. 
 
After security patch level updates on my Samsung Galaxy Note 8 on 26th July 2020 the IMEI number of my phone is not showing, though there is SIM card is available in the phone it shows insert SIM card or SIM card is not inserted, and  When I try to sing in my Samsung account in my Samsung Galaxy Note 8 it shows Processing/Registering failed, when I try to check updates then also it shows Processing/Registering failed and when I tap the SIM manager it  shows com.android.phone is not responsibl and whenever I dial *#06# the entire display becomes BLACK for 8 to 10 minutes and shows Processing/Registering failed