How to create wildcard subdomain?

How can i create wildcard subdomain? like “*.domain.com”
when i am trying to create wildcard subdomain it’s say invalid domain.

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I also wonder since you already have SSL v2 with wildcard SSL…

Hello @fattain.naime sir
Have you any solution for this how to create wildcard subdomain in cyber panel?

If, yes can you please share me the step?

I have shifted to other panel.