Service Bus Namespace Disaster recovery config gives key type error

Question

Hello Community,

I am trying to create a disaster recovery pairing between two servicebus namespaces in two different regions (both of premium sku and partitioned) and using customer managed keys.
I have configured the below
Rg1, location uksouth:

1. keyvault with pvt endpoint - keyvault-for-sb
2. two keys with RSA type 2048 and 4096 bits
3. service bus namespace - sb1
4. User managed identity1
5. Assigned role "Keyvault crypto service encryption user" to User managed identity1 for keyvault-for-sb
6. Configured cmk and usermanaged identity1 in "encryption" setting of sb1

Rg1, location east us:

1. service bus namespace - sb2
2. User managed identity2
3. Assigned role "Keyvault crypto service encryption user" to User managed identity2 for keyvault-for-sb
4. Configured cmk using keyvault-for-sb from and usermanaged identity2 in "encryption" setting of sb2

I tried using RSA key of 2048 and 4096 size both , however i am getting an error as below:
"Request to Key Vault failed. This can happen if you are trying to configure an unsupported KeyVault key type, such as EC. Currently only RSA keys are supported. CorrelationId: d926ac5xxxxx8629-81a1462aa504"