I was writing above line it at the wrong place inside the XML.
Finally , the below line worked
<TechnicalProfile Id="AAD-UserWritePhoneNumberUsingObjectId">
<PersistedClaims>
<PersistedClaim ClaimTypeReferenceId="Verified.strongAuthenticationPhoneNumber" PartnerClaimType="mobile" />
</PersistedClaims>
</TechnicalProfile>