Lets Go Pikachu Nintendo Switch & Pokemon Go (cell phone) connect how?

My girlfriend has a Nintendo Switch & Lets Go Pikachu now she has played so far in the game that you can theoretically connect / transfer Lets Go Pikachu & Pokemon Go but how exactly does this work?

https://www.nintendo.de/...71456.html

There it is explained:,)

Thank you.

Please ^^

Here's how to do it:

https://pokemonletsgo.pokemon.com/de-de/pokemon-go/

Thanks have already made it thanks.

With pleasure! Lg