Dual sim card volte not support

I downgrade my asus rog phone 2 android 10 to android 9 and i see the not working dual sim card in volte only one sim card work in volte
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I downgrade my asus rog phone 2 android 10 to android 9 and i see the not working dual sim card in volte only one sim card work in volte
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Hi, please specify the below.
Current firmware version.
SIM's you are using & your region. Have you checked with your Network provider with any recent changes?