Uncaught Error: Call to undefined function mb_internal_encoding() when upgrading to 2.3.3

I am trying to upgrade xenforo on my test server, a windows box using MAMP.

This is not a Xenforo issue, but my environment that has issues, I know. But as my google skills hasn't gotten me anywhere, I thought I should try here.

I have tested a couple of PHP versions with the same result: "Uncaught Error: Call to undefined function mb_internal_encoding() in F:\htdocs\forum\src\XF.php:138"
I have checked these points:

• php.ini has this line: "extension=php_mbstring.dll" (no...

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