Cellular issue on Apple Watch Ultra 2

my apple watch ultra 2 app is showing that your vi account is not eligible to enable mobile service on your apple watch ,contact vi for further details..could this be because i purchased my watch from US..my watch model number is A2986 ultra 2 and I updated my watch and iPhone(15pro max)to the latest version as well and then tried again but no result ..Also spoke on customer support of VI where they said that VI doesn’t support watches purchased from outside India..so any one else facing a similar issue and have a solution to this then please let me know