How to resolve imported certificate is a self signed certificate error in AFD even though it is a certificate issued by a private CA?

Question

First I created CA in key vault (issuer is OnecertV2-PrivateCA)

then generated certificate with the domain name

but when I try to add this certificate in AFD it gives the following error:
'cannot add secret as self signed certificate is not allowed in BYOC'

but it is clearly not a self signed cert -it is issued by onecert-privateca.
How to resolve this?
error.jpg