Try these specific fixes for the error:
https://thegeekpage.com/microsoft-store-error-c...
https://www.wintips.org/fix-microsoft-store-err...
https://answers.microsoft.com/en-us/windows/for...
https://www.saintlad.com/microsoft-store-error-...
https://digiworthy.com/2020/10/10/fix-error-cod...
If none of those work then continue with the steps I gave in my first post to repair the Store. One of the steps should work. If you will report back results of each step as you go, I may have other suggestions.
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