I have problems with many-to-many connections

[StraikerB12]

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I followed the documentation but in the end it doesn't work.
https://lighthouse-php.com/6/eloquent/nested-mutations.html#belongstomany
I get an sql error when trying to create a Post and attach a Tag to it.
The "connect" function also does not work.

How to solve these problems ?
I attach a photo