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Thanks for reply.
I came to a conculation that anyone like me should watch these two videos & got solution

Thank you

Hi Carl B,
Thanks for reply.
We are still using Yoast Premium.
But still it shows such error message.

Here is the screenhsot: https://prnt.sc/uddx6e

Actually my client doesn’t know why the problem is showing & even I don’t know the proper way to put multiple keyphrases

example of some keyphrases I used:
Yoast SEO Plugin
Yoast SEO Premium
Yoast Woocommerce

To add multiple keyphrases should I use comma(,) ??
e.g. “Yoast SEO Booster, Yoast Woo SEO”